TY  - JOUR
AU  - Mitrašinović, Aleksandar M.
AU  - Momčilović, Dejan B.
AU  - Odanović, Zoran
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7500
AB  - Assessing heat released only related to the formation of primary crystals provides results with a significantly higher sensitivity than a traditional assessment of undercooling value. In this work, two similar Ti5B1 master alloys (commercial and refined) are used for grain refinement of Al7Si4Cu aluminum alloy to assess narrow differences in heat release during primary crystallization. The heat released related to primary crystallization is 2.50 +/- 0.03, 3.16 +/- 0.12, and 7.92 kJ kg(-1) for samples treated with the refined master alloys, commercial master alloys, and sample solidified without grain refinement, respectively. The acquired results showed that the suggested method is more efficient in comparison with traditional metallographic or undercooling methods for the assessment of grain refining efficiency with the potential to extend the suggested approach on a wide range of metallic structures where solidification occurs by eutectic-type primary crystallization characteristics.
PB  - Springer India, New Delhi
T2  - Transactions of the Indian Institute of Metals
T1  - Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy
EP  - 1922
IS  - 8
SP  - 1917
VL  - 74
DO  - 10.1007/s12666-021-02279-6
ER  - 

@article{
author = "Mitrašinović, Aleksandar M. and Momčilović, Dejan B. and Odanović, Zoran",
abstract = "Assessing heat released only related to the formation of primary crystals provides results with a significantly higher sensitivity than a traditional assessment of undercooling value. In this work, two similar Ti5B1 master alloys (commercial and refined) are used for grain refinement of Al7Si4Cu aluminum alloy to assess narrow differences in heat release during primary crystallization. The heat released related to primary crystallization is 2.50 +/- 0.03, 3.16 +/- 0.12, and 7.92 kJ kg(-1) for samples treated with the refined master alloys, commercial master alloys, and sample solidified without grain refinement, respectively. The acquired results showed that the suggested method is more efficient in comparison with traditional metallographic or undercooling methods for the assessment of grain refining efficiency with the potential to extend the suggested approach on a wide range of metallic structures where solidification occurs by eutectic-type primary crystallization characteristics.",
publisher = "Springer India, New Delhi",
journal = "Transactions of the Indian Institute of Metals",
title = "Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy",
pages = "1922-1917",
number = "8",
volume = "74",
doi = "10.1007/s12666-021-02279-6"
}

Mitrašinović, A. M., Momčilović, D. B.,& Odanović, Z..Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy. in Transactions of the Indian Institute of Metals
Springer India, New Delhi., 74(8), 1917-1922.
https://doi.org/10.1007/s12666-021-02279-6

Mitrašinović AM, Momčilović DB, Odanović Z. Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy. in Transactions of the Indian Institute of Metals.74(8):1917-1922.
doi:10.1007/s12666-021-02279-6 .

Mitrašinović, Aleksandar M., Momčilović, Dejan B., Odanović, Zoran, "Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy" in Transactions of the Indian Institute of Metals, 74, no. 8:1917-1922,
https://doi.org/10.1007/s12666-021-02279-6 . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Bobić, Ilija
AU  - Stanković, Miloš
AU  - Hvizdos, Pavol
AU  - Bobić, Biljana
AU  - Stojanović, Blaža
AU  - Franek, Friedrich
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3273
AB  - Metal matrix composites are very inhomogeneous materials, and their properties depend on various parameters (production process, constituents, their interfaces, etc.). The influence of SiC microparticles (40 mu m) reinforcement and graphite macroparticles (200-800 mu m) addition on the mechanical properties of Al-Si A356 alloy, produced by compocasting, has been assessed using macro- and nanoscale measurements of hardness and modulus of elasticity. The Al makes over 90 wt% of the A356 alloy, so the nanoscale measurements were performed on different alpha phase regions on each material (core of alpha phase, eutectic alpha phase, and alpha phase near the phase boundaries alpha phase/secondary phases). The results showed that there is no direct correlation between mechanical properties on macro- and nanoscale. The nanoscale results also showed that the secondary phases (SiC and graphite particles) can have significant effect on the mechanical properties on the atomic level, i.e. in the alpha phase regions very close to the secondary phases.
PB  - Springer Heidelberg, Heidelberg
T2  - Journal of The Brazilian Society of Mechanical Sciences and Engineering
T1  - Influence of secondary phases in A356 MMCs on their mechanical properties at macro- and nanoscale
IS  - 3
VL  - 42
DO  - 10.1007/s40430-020-2197-6
ER  - 

@article{
author = "Vencl, Aleksandar and Bobić, Ilija and Stanković, Miloš and Hvizdos, Pavol and Bobić, Biljana and Stojanović, Blaža and Franek, Friedrich",
year = "2020",
abstract = "Metal matrix composites are very inhomogeneous materials, and their properties depend on various parameters (production process, constituents, their interfaces, etc.). The influence of SiC microparticles (40 mu m) reinforcement and graphite macroparticles (200-800 mu m) addition on the mechanical properties of Al-Si A356 alloy, produced by compocasting, has been assessed using macro- and nanoscale measurements of hardness and modulus of elasticity. The Al makes over 90 wt% of the A356 alloy, so the nanoscale measurements were performed on different alpha phase regions on each material (core of alpha phase, eutectic alpha phase, and alpha phase near the phase boundaries alpha phase/secondary phases). The results showed that there is no direct correlation between mechanical properties on macro- and nanoscale. The nanoscale results also showed that the secondary phases (SiC and graphite particles) can have significant effect on the mechanical properties on the atomic level, i.e. in the alpha phase regions very close to the secondary phases.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Journal of The Brazilian Society of Mechanical Sciences and Engineering",
title = "Influence of secondary phases in A356 MMCs on their mechanical properties at macro- and nanoscale",
number = "3",
volume = "42",
doi = "10.1007/s40430-020-2197-6"
}

Vencl, A., Bobić, I., Stanković, M., Hvizdos, P., Bobić, B., Stojanović, B.,& Franek, F.. (2020). Influence of secondary phases in A356 MMCs on their mechanical properties at macro- and nanoscale. in Journal of The Brazilian Society of Mechanical Sciences and Engineering
Springer Heidelberg, Heidelberg., 42(3).
https://doi.org/10.1007/s40430-020-2197-6

Vencl A, Bobić I, Stanković M, Hvizdos P, Bobić B, Stojanović B, Franek F. Influence of secondary phases in A356 MMCs on their mechanical properties at macro- and nanoscale. in Journal of The Brazilian Society of Mechanical Sciences and Engineering. 2020;42(3).
doi:10.1007/s40430-020-2197-6 .

Vencl, Aleksandar, Bobić, Ilija, Stanković, Miloš, Hvizdos, Pavol, Bobić, Biljana, Stojanović, Blaža, Franek, Friedrich, "Influence of secondary phases in A356 MMCs on their mechanical properties at macro- and nanoscale" in Journal of The Brazilian Society of Mechanical Sciences and Engineering, 42, no. 3 (2020),
https://doi.org/10.1007/s40430-020-2197-6 . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Vučetić, Filip
AU  - Bobić, Biljana
AU  - Pitel, Jan
AU  - Bobić, Ilija
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3146
AB  - The influence of SiC microparticles reinforcement and graphite macroparticles addition on the friction and wear characteristics of A356 Al-Si alloys, produced by compocasting, has been assessed using a pin-on-disc tribometer. The incorporation of SiC reinforcement increased the coefficient of friction and reduced the wear. The addition of graphite did not reduce the coefficient of friction. In the case of hybrid composite with 1wt% graphite, wear was more or less the same as with SiC reinforced composite, while in the case of hybrid composite with 3wt% graphite, wear was further reduced. On the worn surfaces of hybrid composites, the presence of the discontinuous mixed surface layer, containing graphite and transferred counter-body material, was noticed.
PB  - Springer London Ltd, London
T2  - International Journal of Advanced Manufacturing Technology
T1  - Tribological characterisation in dry sliding conditions of compocasted
hybrid A356/SiCp/Grp composites with graphite macroparticles
EP  - 2146
IS  - 9-12
SP  - 2135
VL  - 100
DO  - 10.1007/s00170-018-2866-0
ER  - 

@article{
author = "Vencl, Aleksandar and Vučetić, Filip and Bobić, Biljana and Pitel, Jan and Bobić, Ilija",
year = "2019",
abstract = "The influence of SiC microparticles reinforcement and graphite macroparticles addition on the friction and wear characteristics of A356 Al-Si alloys, produced by compocasting, has been assessed using a pin-on-disc tribometer. The incorporation of SiC reinforcement increased the coefficient of friction and reduced the wear. The addition of graphite did not reduce the coefficient of friction. In the case of hybrid composite with 1wt% graphite, wear was more or less the same as with SiC reinforced composite, while in the case of hybrid composite with 3wt% graphite, wear was further reduced. On the worn surfaces of hybrid composites, the presence of the discontinuous mixed surface layer, containing graphite and transferred counter-body material, was noticed.",
publisher = "Springer London Ltd, London",
journal = "International Journal of Advanced Manufacturing Technology",
title = "Tribological characterisation in dry sliding conditions of compocasted
hybrid A356/SiCp/Grp composites with graphite macroparticles",
pages = "2146-2135",
number = "9-12",
volume = "100",
doi = "10.1007/s00170-018-2866-0"
}

Vencl, A., Vučetić, F., Bobić, B., Pitel, J.,& Bobić, I.. (2019). Tribological characterisation in dry sliding conditions of compocasted
hybrid A356/SiCp/Grp composites with graphite macroparticles. in International Journal of Advanced Manufacturing Technology
Springer London Ltd, London., 100(9-12), 2135-2146.
https://doi.org/10.1007/s00170-018-2866-0

Vencl A, Vučetić F, Bobić B, Pitel J, Bobić I. Tribological characterisation in dry sliding conditions of compocasted
hybrid A356/SiCp/Grp composites with graphite macroparticles. in International Journal of Advanced Manufacturing Technology. 2019;100(9-12):2135-2146.
doi:10.1007/s00170-018-2866-0 .

Vencl, Aleksandar, Vučetić, Filip, Bobić, Biljana, Pitel, Jan, Bobić, Ilija, "Tribological characterisation in dry sliding conditions of compocasted
hybrid A356/SiCp/Grp composites with graphite macroparticles" in International Journal of Advanced Manufacturing Technology, 100, no. 9-12 (2019):2135-2146,
https://doi.org/10.1007/s00170-018-2866-0 . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Bobić, Ilija
AU  - Bobić, Biljana
AU  - Jakimovska, Kristina
AU  - Svoboda, Petr
AU  - Kandeva, Mara
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3140
AB  - Metal matrix nanocomposites (MMnCs) comprise a metal matrix filled with nanosized reinforcements with physical and mechanical properties that are very different from those of the matrix. In ZA-27 alloy-based nanocomposites, the metal matrix provides ductility and toughness, while usually used ceramic reinforcements give high strength and hardness. Tested ZA-27 alloy-based nanocomposites, reinforced with different types (SiC and Al2O3), amounts (0.2 wt.%, 0.3 wt.%, and 0.5 wt.%) and sizes (25 nm, 50 nm, and 100 nm) of nanoparticles were produced through the compocasting process with mechanical alloying pre-processing (ball milling). It was previously shown that the presence of nanoparticles in ZA-27 alloy-based nanocomposites led to the formation of a finer structure in the nanocomposites matrix and an improvement in the basic mechanical properties (hardness and compressive yield strength) through the enhanced dislocation density strengthening mechanism. Solid particle erosive wear testing demonstrated that these improvements were followed with an increase in the erosive wear resistance of tested nanocomposites, as well. Additionally, by analyzing the influences of type, amount, and size of nanoparticles on the erosive wear resistance of nanocomposites, it was demonstrated that there is an optimal amount of nanoparticles, which in our case is 0.3 wt.%, and that the presence of SiC nanoparticles and smaller nanoparticles in nanocomposites had more beneficial influence on erosive wear resistance.
PB  - Springeropen, London
T2  - Friction
T1  - Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements
EP  - 350
IS  - 4
SP  - 340
VL  - 7
DO  - 10.1007/s40544-018-0222-x
ER  - 

@article{
author = "Vencl, Aleksandar and Bobić, Ilija and Bobić, Biljana and Jakimovska, Kristina and Svoboda, Petr and Kandeva, Mara",
year = "2019",
abstract = "Metal matrix nanocomposites (MMnCs) comprise a metal matrix filled with nanosized reinforcements with physical and mechanical properties that are very different from those of the matrix. In ZA-27 alloy-based nanocomposites, the metal matrix provides ductility and toughness, while usually used ceramic reinforcements give high strength and hardness. Tested ZA-27 alloy-based nanocomposites, reinforced with different types (SiC and Al2O3), amounts (0.2 wt.%, 0.3 wt.%, and 0.5 wt.%) and sizes (25 nm, 50 nm, and 100 nm) of nanoparticles were produced through the compocasting process with mechanical alloying pre-processing (ball milling). It was previously shown that the presence of nanoparticles in ZA-27 alloy-based nanocomposites led to the formation of a finer structure in the nanocomposites matrix and an improvement in the basic mechanical properties (hardness and compressive yield strength) through the enhanced dislocation density strengthening mechanism. Solid particle erosive wear testing demonstrated that these improvements were followed with an increase in the erosive wear resistance of tested nanocomposites, as well. Additionally, by analyzing the influences of type, amount, and size of nanoparticles on the erosive wear resistance of nanocomposites, it was demonstrated that there is an optimal amount of nanoparticles, which in our case is 0.3 wt.%, and that the presence of SiC nanoparticles and smaller nanoparticles in nanocomposites had more beneficial influence on erosive wear resistance.",
publisher = "Springeropen, London",
journal = "Friction",
title = "Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements",
pages = "350-340",
number = "4",
volume = "7",
doi = "10.1007/s40544-018-0222-x"
}

Vencl, A., Bobić, I., Bobić, B., Jakimovska, K., Svoboda, P.,& Kandeva, M.. (2019). Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements. in Friction
Springeropen, London., 7(4), 340-350.
https://doi.org/10.1007/s40544-018-0222-x

Vencl A, Bobić I, Bobić B, Jakimovska K, Svoboda P, Kandeva M. Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements. in Friction. 2019;7(4):340-350.
doi:10.1007/s40544-018-0222-x .

Vencl, Aleksandar, Bobić, Ilija, Bobić, Biljana, Jakimovska, Kristina, Svoboda, Petr, Kandeva, Mara, "Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements" in Friction, 7, no. 4 (2019):340-350,
https://doi.org/10.1007/s40544-018-0222-x . .

TY  - JOUR
AU  - Bobić, Biljana
AU  - Vencl, Aleksandar
AU  - Ruzić, Jovana
AU  - Bobić, Ilija
AU  - Damnjanović, Zvonko
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3160
AB  - Particulate nanocomposites with the base of ZA27 alloy were synthesized using an innovative route, which includes mechanical milling and compocasting. Scrap from the matrix alloy and ceramic nanoreinforcements were mechanically milled using the ball-milling technique, which led to the formation of composite microparticles. The use of these particles in the compocasting process provided better wettability of ceramic nanoreinforcements in the semi-solid metal matrix, which resulted in a relatively good dispersion of the nanoreinforcements in nanocomposite castings. The presence of nanoreinforcements led to the grain refinement in the matrix of nanocomposites. The mechanical properties of the synthesized nanocomposites are improved and compared with the properties of the metal matrix. The observed increase in the hardness of nanocomposites with Al2O3 nanoreinforcements (20-30 nm) was 6.5% to 10.8%, while the yield strength of these nanocomposites has increased by 12.2% to 23.2%. The hardness and compressive yield strength of the nanocomposites with Al2O3 nanoparticles (100 nm) increased by 1.7% to 8.0% and 2.3% to 8.3%, respectively. The increase in hardness of the nanocomposites with SiC nanoparticles (50 nm) was 11.5% to 20.6%, while the increase in the yield strength was 15.6% to 24.5%. The greatest contribution to the overall strengthening in the synthesized nanocomposites is the result of increased dislocation density due to the difference in coefficients of thermal expansion for the matrix alloy and nanoreinforcements.
PB  - Sage Publications Ltd, London
T2  - Journal of Composite Materials
T1  - Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting
EP  - 2046
IS  - 15
SP  - 2033
VL  - 53
DO  - 10.1177/0021998318817876
ER  - 

@article{
author = "Bobić, Biljana and Vencl, Aleksandar and Ruzić, Jovana and Bobić, Ilija and Damnjanović, Zvonko",
year = "2019",
abstract = "Particulate nanocomposites with the base of ZA27 alloy were synthesized using an innovative route, which includes mechanical milling and compocasting. Scrap from the matrix alloy and ceramic nanoreinforcements were mechanically milled using the ball-milling technique, which led to the formation of composite microparticles. The use of these particles in the compocasting process provided better wettability of ceramic nanoreinforcements in the semi-solid metal matrix, which resulted in a relatively good dispersion of the nanoreinforcements in nanocomposite castings. The presence of nanoreinforcements led to the grain refinement in the matrix of nanocomposites. The mechanical properties of the synthesized nanocomposites are improved and compared with the properties of the metal matrix. The observed increase in the hardness of nanocomposites with Al2O3 nanoreinforcements (20-30 nm) was 6.5% to 10.8%, while the yield strength of these nanocomposites has increased by 12.2% to 23.2%. The hardness and compressive yield strength of the nanocomposites with Al2O3 nanoparticles (100 nm) increased by 1.7% to 8.0% and 2.3% to 8.3%, respectively. The increase in hardness of the nanocomposites with SiC nanoparticles (50 nm) was 11.5% to 20.6%, while the increase in the yield strength was 15.6% to 24.5%. The greatest contribution to the overall strengthening in the synthesized nanocomposites is the result of increased dislocation density due to the difference in coefficients of thermal expansion for the matrix alloy and nanoreinforcements.",
publisher = "Sage Publications Ltd, London",
journal = "Journal of Composite Materials",
title = "Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting",
pages = "2046-2033",
number = "15",
volume = "53",
doi = "10.1177/0021998318817876"
}

Bobić, B., Vencl, A., Ruzić, J., Bobić, I.,& Damnjanović, Z.. (2019). Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting. in Journal of Composite Materials
Sage Publications Ltd, London., 53(15), 2033-2046.
https://doi.org/10.1177/0021998318817876

Bobić B, Vencl A, Ruzić J, Bobić I, Damnjanović Z. Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting. in Journal of Composite Materials. 2019;53(15):2033-2046.
doi:10.1177/0021998318817876 .

Bobić, Biljana, Vencl, Aleksandar, Ruzić, Jovana, Bobić, Ilija, Damnjanović, Zvonko, "Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting" in Journal of Composite Materials, 53, no. 15 (2019):2033-2046,
https://doi.org/10.1177/0021998318817876 . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Bobić, Biljana
AU  - Vučetić, Filip
AU  - Svoboda, Petr
AU  - Popović, Vladimir
AU  - Bobić, Ilija
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2827
AB  - Nanocomposites were synthesized via compocasting using Zn25Al3Si and Zn25Al3Si0.03Sr alloys as the matrices and nanoparticles of Al2O3 (1 wt%) as the reinforcement. Structure of the nanocomposites was examined, and their basic mechanical and tribological properties were tested. Distribution of primary silicon particles in the structure of nanocomposites has been improved compared to their distribution in the Zn25Al3Si matrix alloy due to the presence of Al2O3 nanoparticles and strontium. The primary silicon particles in the structure of the nanocomposites were found to be more fine-grained compared to the same particles in the structure of the as-cast Zn25Al3Si alloy. Tested mechanical properties of the nanocomposite with Zn25Al3Si alloy matrix are improved, compared to the matrix alloy. The nanocomposite with Zn25Al3Si0.03Sr alloy matrix is characterized with slightly higher value of compressive yield strength and a slightly lower hardness value compared to the as-cast Zn25Al3Si alloy. Both nanocomposites showed lower wear rate and higher coefficient of friction, compared to the matrix alloy, in sliding under the boundary lubricating regime. However, the nanocomposite with Zn25Al3Si alloy matrix showed better tribological properties than the nanocomposite with Zn25Al3Si0.03Sr alloy matrix.
PB  - Springer Heidelberg, Heidelberg
T2  - Journal of The Brazilian Society of Mechanical Sciences and Engineering
T1  - Effect of Al2O3 nanoparticles and strontium addition on structural, mechanical and tribological properties of Zn25Al3Si alloy
IS  - 11
VL  - 40
DO  - 10.1007/s40430-018-1441-9
ER  - 

@article{
author = "Vencl, Aleksandar and Bobić, Biljana and Vučetić, Filip and Svoboda, Petr and Popović, Vladimir and Bobić, Ilija",
year = "2018",
abstract = "Nanocomposites were synthesized via compocasting using Zn25Al3Si and Zn25Al3Si0.03Sr alloys as the matrices and nanoparticles of Al2O3 (1 wt%) as the reinforcement. Structure of the nanocomposites was examined, and their basic mechanical and tribological properties were tested. Distribution of primary silicon particles in the structure of nanocomposites has been improved compared to their distribution in the Zn25Al3Si matrix alloy due to the presence of Al2O3 nanoparticles and strontium. The primary silicon particles in the structure of the nanocomposites were found to be more fine-grained compared to the same particles in the structure of the as-cast Zn25Al3Si alloy. Tested mechanical properties of the nanocomposite with Zn25Al3Si alloy matrix are improved, compared to the matrix alloy. The nanocomposite with Zn25Al3Si0.03Sr alloy matrix is characterized with slightly higher value of compressive yield strength and a slightly lower hardness value compared to the as-cast Zn25Al3Si alloy. Both nanocomposites showed lower wear rate and higher coefficient of friction, compared to the matrix alloy, in sliding under the boundary lubricating regime. However, the nanocomposite with Zn25Al3Si alloy matrix showed better tribological properties than the nanocomposite with Zn25Al3Si0.03Sr alloy matrix.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Journal of The Brazilian Society of Mechanical Sciences and Engineering",
title = "Effect of Al2O3 nanoparticles and strontium addition on structural, mechanical and tribological properties of Zn25Al3Si alloy",
number = "11",
volume = "40",
doi = "10.1007/s40430-018-1441-9"
}

Vencl, A., Bobić, B., Vučetić, F., Svoboda, P., Popović, V.,& Bobić, I.. (2018). Effect of Al2O3 nanoparticles and strontium addition on structural, mechanical and tribological properties of Zn25Al3Si alloy. in Journal of The Brazilian Society of Mechanical Sciences and Engineering
Springer Heidelberg, Heidelberg., 40(11).
https://doi.org/10.1007/s40430-018-1441-9

Vencl A, Bobić B, Vučetić F, Svoboda P, Popović V, Bobić I. Effect of Al2O3 nanoparticles and strontium addition on structural, mechanical and tribological properties of Zn25Al3Si alloy. in Journal of The Brazilian Society of Mechanical Sciences and Engineering. 2018;40(11).
doi:10.1007/s40430-018-1441-9 .

Vencl, Aleksandar, Bobić, Biljana, Vučetić, Filip, Svoboda, Petr, Popović, Vladimir, Bobić, Ilija, "Effect of Al2O3 nanoparticles and strontium addition on structural, mechanical and tribological properties of Zn25Al3Si alloy" in Journal of The Brazilian Society of Mechanical Sciences and Engineering, 40, no. 11 (2018),
https://doi.org/10.1007/s40430-018-1441-9 . .

TY  - JOUR
AU  - Bobić, Biljana
AU  - Bobić, Ilija
AU  - Vencl, Aleksandar
AU  - Babić, M.
AU  - Mitrović, Slobodan
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2374
AB  - The corrosion behavior of particulate ZA27/SiCp composites in an aerated sodium chloride solution was studied. The composites were synthesized via compocasting with addition of 1, 3 and 5 wt.% SiC particles in the matrix alloy. Composite samples were immersed for 30 days in the 3.5 wt.% NaCl solution open to the atmospheric air. Surface appearance and microstructure of the composites were examined by means of optical microscopy and scanning electron microscopy, while corrosion rates of the composites were determined using the weight loss method. It was revealed that SiC particles were not influenced by corrosion. General uniform corrosion occurred in the composite matrices, mainly in the region of the η phase. Local corrosion was noticed in micro-cracks and near clusters of particulate reinforcements. Results of microstructural examinations and immersion test indicate a slightly lower corrosion resistance of the ZA27/SiCp composites compared to that of the matrix alloy.
PB  - Fakultet inženjerskih nauka, Kragujevac
T2  - Tribology in Industry
T1  - Corrosion behavior of compocasted ZA27/SiCp composites in sodium chloride solution
EP  - 120
IS  - 1
SP  - 115
VL  - 38
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2374
ER  - 

@article{
author = "Bobić, Biljana and Bobić, Ilija and Vencl, Aleksandar and Babić, M. and Mitrović, Slobodan",
year = "2016",
abstract = "The corrosion behavior of particulate ZA27/SiCp composites in an aerated sodium chloride solution was studied. The composites were synthesized via compocasting with addition of 1, 3 and 5 wt.% SiC particles in the matrix alloy. Composite samples were immersed for 30 days in the 3.5 wt.% NaCl solution open to the atmospheric air. Surface appearance and microstructure of the composites were examined by means of optical microscopy and scanning electron microscopy, while corrosion rates of the composites were determined using the weight loss method. It was revealed that SiC particles were not influenced by corrosion. General uniform corrosion occurred in the composite matrices, mainly in the region of the η phase. Local corrosion was noticed in micro-cracks and near clusters of particulate reinforcements. Results of microstructural examinations and immersion test indicate a slightly lower corrosion resistance of the ZA27/SiCp composites compared to that of the matrix alloy.",
publisher = "Fakultet inženjerskih nauka, Kragujevac",
journal = "Tribology in Industry",
title = "Corrosion behavior of compocasted ZA27/SiCp composites in sodium chloride solution",
pages = "120-115",
number = "1",
volume = "38",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2374"
}

Bobić, B., Bobić, I., Vencl, A., Babić, M.,& Mitrović, S.. (2016). Corrosion behavior of compocasted ZA27/SiCp composites in sodium chloride solution. in Tribology in Industry
Fakultet inženjerskih nauka, Kragujevac., 38(1), 115-120.
https://hdl.handle.net/21.15107/rcub_machinery_2374

Bobić B, Bobić I, Vencl A, Babić M, Mitrović S. Corrosion behavior of compocasted ZA27/SiCp composites in sodium chloride solution. in Tribology in Industry. 2016;38(1):115-120.
https://hdl.handle.net/21.15107/rcub_machinery_2374 .

Bobić, Biljana, Bobić, Ilija, Vencl, Aleksandar, Babić, M., Mitrović, Slobodan, "Corrosion behavior of compocasted ZA27/SiCp composites in sodium chloride solution" in Tribology in Industry, 38, no. 1 (2016):115-120,
https://hdl.handle.net/21.15107/rcub_machinery_2374 .

TY  - CONF
AU  - Vencl, Aleksandar
AU  - Rajkovic, Viseslava
AU  - Zivic, Fatima
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4342
AB  - Copper-based composites with hard particles are widely applied in electrical sliding contacts such as those in railway overhead current collection system, lead frame in large scale integrated-circuit, welding electrodes, transfer switches and electrical contact material. Powder metallurgy is the most applicable technology way of producing the copper-based composites, especially when the matrix material is reinforced with second phase particles. Two copper-based composites reinforced with micro-sized Al2O3 particles (app. 750 nm in size) and nano-sized Al2O3 particles (less than 100 nm in size), and produced by powder metallurgy technology, were compared with a Cu-Cr-Zr alloy produced by casting technique. The tribological tests were carried-out on ball-on-disc nanotribometer, under the high-load (1 N), low-speed (8 mm/s) dry sliding condition. The addition of micro-sized Al2O3 particles did not showed so beneficiary effect, since this composite had the lowest hardness and wear resistance, and at the same time, the highest coefficient of friction. On the other hand the addition of nano-sized Al2O3 particles increased considerably hardness of composite and improved the wear resistance to a significant extent, and also reduces the coefficient of friction.
C3  - Proceedings of the 8th International Conference on Tribology – BALKANTRIB '14
T1  - Friction and wear properties of copper-based composites reinforced with micro- and nano-sized Al2O3 particles
EP  - 364
SP  - 357
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4342
ER  - 

@conference{
author = "Vencl, Aleksandar and Rajkovic, Viseslava and Zivic, Fatima",
year = "2014",
abstract = "Copper-based composites with hard particles are widely applied in electrical sliding contacts such as those in railway overhead current collection system, lead frame in large scale integrated-circuit, welding electrodes, transfer switches and electrical contact material. Powder metallurgy is the most applicable technology way of producing the copper-based composites, especially when the matrix material is reinforced with second phase particles. Two copper-based composites reinforced with micro-sized Al2O3 particles (app. 750 nm in size) and nano-sized Al2O3 particles (less than 100 nm in size), and produced by powder metallurgy technology, were compared with a Cu-Cr-Zr alloy produced by casting technique. The tribological tests were carried-out on ball-on-disc nanotribometer, under the high-load (1 N), low-speed (8 mm/s) dry sliding condition. The addition of micro-sized Al2O3 particles did not showed so beneficiary effect, since this composite had the lowest hardness and wear resistance, and at the same time, the highest coefficient of friction. On the other hand the addition of nano-sized Al2O3 particles increased considerably hardness of composite and improved the wear resistance to a significant extent, and also reduces the coefficient of friction.",
journal = "Proceedings of the 8th International Conference on Tribology – BALKANTRIB '14",
title = "Friction and wear properties of copper-based composites reinforced with micro- and nano-sized Al2O3 particles",
pages = "364-357",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4342"
}

Vencl, A., Rajkovic, V.,& Zivic, F.. (2014). Friction and wear properties of copper-based composites reinforced with micro- and nano-sized Al2O3 particles. in Proceedings of the 8th International Conference on Tribology – BALKANTRIB '14, 357-364.
https://hdl.handle.net/21.15107/rcub_machinery_4342

Vencl A, Rajkovic V, Zivic F. Friction and wear properties of copper-based composites reinforced with micro- and nano-sized Al2O3 particles. in Proceedings of the 8th International Conference on Tribology – BALKANTRIB '14. 2014;:357-364.
https://hdl.handle.net/21.15107/rcub_machinery_4342 .

Vencl, Aleksandar, Rajkovic, Viseslava, Zivic, Fatima, "Friction and wear properties of copper-based composites reinforced with micro- and nano-sized Al2O3 particles" in Proceedings of the 8th International Conference on Tribology – BALKANTRIB '14 (2014):357-364,
https://hdl.handle.net/21.15107/rcub_machinery_4342 .

TY  - JOUR
AU  - Bobić, Ilija
AU  - Ruzić, Jovana
AU  - Bobić, Biljana
AU  - Babić, Miroslav
AU  - Vencl, Aleksandar
AU  - Mitrović, Slobodan
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1892
AB  - Hybrid A356/SiCp/Gr(p) composites were produced via compo-casting using the A356 aluminum alloy as the composite matrix, with silicon carbide microparticles (SiCp) and graphite macroparticles (Gr(p)) as reinforcements. The effect of the thixocasting process on the microstructure of a modified A356 alloy (with 0.03 mass% of strontium) was considered. The microstructures of the thixocast A356 alloy and the synthesized composite materials were examined by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD). The fracture surfaces of the composite matrix and the composites were also analyzed. The thixocast A356 alloy and the composites were subjected to artificial aging after a solution heat treatment. Aging kinetics was followed by hardness measurements. Differential scanning calorimetry (DSC) was applied to reveal the presence of phases formed during artificial aging. The composites reached maximum hardness faster than the thixocast A356 alloy. The time required to attain peak hardness decreases with the increase in the content of particulate reinforcements.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
T1  - Microstructural characterization and artificial aging of compo-casted hybrid A356/SiCp/Gr(p) composites with graphite macroparticles
EP  - 15
SP  - 7
VL  - 612
DO  - 10.1016/j.msea.2014.06.028
ER  - 

@article{
author = "Bobić, Ilija and Ruzić, Jovana and Bobić, Biljana and Babić, Miroslav and Vencl, Aleksandar and Mitrović, Slobodan",
year = "2014",
abstract = "Hybrid A356/SiCp/Gr(p) composites were produced via compo-casting using the A356 aluminum alloy as the composite matrix, with silicon carbide microparticles (SiCp) and graphite macroparticles (Gr(p)) as reinforcements. The effect of the thixocasting process on the microstructure of a modified A356 alloy (with 0.03 mass% of strontium) was considered. The microstructures of the thixocast A356 alloy and the synthesized composite materials were examined by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD). The fracture surfaces of the composite matrix and the composites were also analyzed. The thixocast A356 alloy and the composites were subjected to artificial aging after a solution heat treatment. Aging kinetics was followed by hardness measurements. Differential scanning calorimetry (DSC) was applied to reveal the presence of phases formed during artificial aging. The composites reached maximum hardness faster than the thixocast A356 alloy. The time required to attain peak hardness decreases with the increase in the content of particulate reinforcements.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing",
title = "Microstructural characterization and artificial aging of compo-casted hybrid A356/SiCp/Gr(p) composites with graphite macroparticles",
pages = "15-7",
volume = "612",
doi = "10.1016/j.msea.2014.06.028"
}

Bobić, I., Ruzić, J., Bobić, B., Babić, M., Vencl, A.,& Mitrović, S.. (2014). Microstructural characterization and artificial aging of compo-casted hybrid A356/SiCp/Gr(p) composites with graphite macroparticles. in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
Elsevier Science Sa, Lausanne., 612, 7-15.
https://doi.org/10.1016/j.msea.2014.06.028

Bobić I, Ruzić J, Bobić B, Babić M, Vencl A, Mitrović S. Microstructural characterization and artificial aging of compo-casted hybrid A356/SiCp/Gr(p) composites with graphite macroparticles. in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing. 2014;612:7-15.
doi:10.1016/j.msea.2014.06.028 .

Bobić, Ilija, Ruzić, Jovana, Bobić, Biljana, Babić, Miroslav, Vencl, Aleksandar, Mitrović, Slobodan, "Microstructural characterization and artificial aging of compo-casted hybrid A356/SiCp/Gr(p) composites with graphite macroparticles" in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 612 (2014):7-15,
https://doi.org/10.1016/j.msea.2014.06.028 . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Bobić, Ilija
AU  - Vučetić, Filip
AU  - Bobić, Biljana
AU  - Ruzić, Jovana
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1908
AB  - The ZA-27 alloy is a zinc-aluminium casting alloy that has been frequently used as the material for sleeves of plain bearings. It has good physical, mechanical and tribological properties. However, one of the major disadvantages is its dimensional instability over a period of time (ageing). To overcome this, copper in the alloy may be replaced with silicon. Coarsening of silicon particles can be controlled by a suitable addition of strontium. In this paper, the commercial ZA-27 alloy and six different Zn25Al alloys (with 1 and 3 wt.% silicon; and with 0, 0.03 and 0.05 wt.% strontium) were obtained by casting in the pre-heated steel mould. Casting of the alloys was carried out at a laboratory level. In the alloys containing silicon, a finer dendritic structure was noticed compared to the structure of the commercial ZA-27 alloy. The addition of strontium influenced the size and distribution of primary silicon particles. Needle-like particles of eutectic silicon were changed into the fibrous ones. The presence of silicon and strontium did not significantly affect mechanical properties of the obtained Zn25Al alloys compared to mechanical properties of the commercial ZA-27 alloy. Wear rate of the alloys containing silicon was lower than that of the ZA-27 alloy. The addition of strontium further lowers the wear rate and slightly increases the coefficient of friction.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Structural, mechanical and tribological characterization of Zn25Al alloys with Si and Sr addition
EP  - 392
SP  - 381
VL  - 64
DO  - 10.1016/j.matdes.2014.07.056
ER  - 

@article{
author = "Vencl, Aleksandar and Bobić, Ilija and Vučetić, Filip and Bobić, Biljana and Ruzić, Jovana",
year = "2014",
abstract = "The ZA-27 alloy is a zinc-aluminium casting alloy that has been frequently used as the material for sleeves of plain bearings. It has good physical, mechanical and tribological properties. However, one of the major disadvantages is its dimensional instability over a period of time (ageing). To overcome this, copper in the alloy may be replaced with silicon. Coarsening of silicon particles can be controlled by a suitable addition of strontium. In this paper, the commercial ZA-27 alloy and six different Zn25Al alloys (with 1 and 3 wt.% silicon; and with 0, 0.03 and 0.05 wt.% strontium) were obtained by casting in the pre-heated steel mould. Casting of the alloys was carried out at a laboratory level. In the alloys containing silicon, a finer dendritic structure was noticed compared to the structure of the commercial ZA-27 alloy. The addition of strontium influenced the size and distribution of primary silicon particles. Needle-like particles of eutectic silicon were changed into the fibrous ones. The presence of silicon and strontium did not significantly affect mechanical properties of the obtained Zn25Al alloys compared to mechanical properties of the commercial ZA-27 alloy. Wear rate of the alloys containing silicon was lower than that of the ZA-27 alloy. The addition of strontium further lowers the wear rate and slightly increases the coefficient of friction.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Structural, mechanical and tribological characterization of Zn25Al alloys with Si and Sr addition",
pages = "392-381",
volume = "64",
doi = "10.1016/j.matdes.2014.07.056"
}

Vencl, A., Bobić, I., Vučetić, F., Bobić, B.,& Ruzić, J.. (2014). Structural, mechanical and tribological characterization of Zn25Al alloys with Si and Sr addition. in Materials & Design
Elsevier Sci Ltd, Oxford., 64, 381-392.
https://doi.org/10.1016/j.matdes.2014.07.056

Vencl A, Bobić I, Vučetić F, Bobić B, Ruzić J. Structural, mechanical and tribological characterization of Zn25Al alloys with Si and Sr addition. in Materials & Design. 2014;64:381-392.
doi:10.1016/j.matdes.2014.07.056 .

Vencl, Aleksandar, Bobić, Ilija, Vučetić, Filip, Bobić, Biljana, Ruzić, Jovana, "Structural, mechanical and tribological characterization of Zn25Al alloys with Si and Sr addition" in Materials & Design, 64 (2014):381-392,
https://doi.org/10.1016/j.matdes.2014.07.056 . .

TY  - CONF
AU  - Bobić, Ilija
AU  - Babić, Miroslav
AU  - Vencl, Aleksandar
AU  - Mitrović, Slobodan
AU  - Bobić, Biljana
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4336
AB  - ZA27 legura sa nedendritnom strukturom dobijena je tiksokasting postupkom. Čestični kompoziti sa osnovom od navedene legure dobijeni su kompokasting postupkom, odnosno infiltracijom 5 vol.% i 10 vol.% SiC čestica u poluočvrsli rastop legure. Uzorci tiksolivene ZA27 legure i kompozita bili su podvrgnuti procesu starenja na 80, 120 i 160°C (T5 režim). Strukturna ispitivanja matrične legure i kompozita i merenja promena tvrdoća tokom procesa starenja izvršena su u zavisnosti od temperature. Pokazano je da prisustvo čestica ojačivača utiče na ubrzanje procesa starenja, odnosno kompoziti dostižu maksimalne vrednosti tvrdoće za kraće vreme nego matrična legura. Sa povećanjem temperature starenja opadaju tvrdoće svih ispitivanih materijala.
C3  - Proceedings of the 13th International Conference on Tribology – SERBIATRIB '13
T1  - Veštačko starenje tiksolivene ZA27 legure i čestičnih ZA27/SiC kompozita
EP  - 413
SP  - 409
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4336
ER  - 

@conference{
author = "Bobić, Ilija and Babić, Miroslav and Vencl, Aleksandar and Mitrović, Slobodan and Bobić, Biljana",
year = "2013",
abstract = "ZA27 legura sa nedendritnom strukturom dobijena je tiksokasting postupkom. Čestični kompoziti sa osnovom od navedene legure dobijeni su kompokasting postupkom, odnosno infiltracijom 5 vol.% i 10 vol.% SiC čestica u poluočvrsli rastop legure. Uzorci tiksolivene ZA27 legure i kompozita bili su podvrgnuti procesu starenja na 80, 120 i 160°C (T5 režim). Strukturna ispitivanja matrične legure i kompozita i merenja promena tvrdoća tokom procesa starenja izvršena su u zavisnosti od temperature. Pokazano je da prisustvo čestica ojačivača utiče na ubrzanje procesa starenja, odnosno kompoziti dostižu maksimalne vrednosti tvrdoće za kraće vreme nego matrična legura. Sa povećanjem temperature starenja opadaju tvrdoće svih ispitivanih materijala.",
journal = "Proceedings of the 13th International Conference on Tribology – SERBIATRIB '13",
title = "Veštačko starenje tiksolivene ZA27 legure i čestičnih ZA27/SiC kompozita",
pages = "413-409",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4336"
}

Bobić, I., Babić, M., Vencl, A., Mitrović, S.,& Bobić, B.. (2013). Veštačko starenje tiksolivene ZA27 legure i čestičnih ZA27/SiC kompozita. in Proceedings of the 13th International Conference on Tribology – SERBIATRIB '13, 409-413.
https://hdl.handle.net/21.15107/rcub_machinery_4336

Bobić I, Babić M, Vencl A, Mitrović S, Bobić B. Veštačko starenje tiksolivene ZA27 legure i čestičnih ZA27/SiC kompozita. in Proceedings of the 13th International Conference on Tribology – SERBIATRIB '13. 2013;:409-413.
https://hdl.handle.net/21.15107/rcub_machinery_4336 .

Bobić, Ilija, Babić, Miroslav, Vencl, Aleksandar, Mitrović, Slobodan, Bobić, Biljana, "Veštačko starenje tiksolivene ZA27 legure i čestičnih ZA27/SiC kompozita" in Proceedings of the 13th International Conference on Tribology – SERBIATRIB '13 (2013):409-413,
https://hdl.handle.net/21.15107/rcub_machinery_4336 .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Rajković, Viseslava
AU  - Zivić, Fatima
AU  - Mitrović, Slobodan
AU  - Cvijović-Alagić, Ivana
AU  - Jovanović, Milan T.
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1711
AB  - Three copper-based alloys, i.e. two composites reinforced with Al2O3 particles and fabricated through PM route and Cu-Cr-Zr alloy processed by the vacuum melting and casting technique were the object of this investigation. Light microscope, scanning electron microscope (SEM) equipped with electron X-ray spectrometer (EDS) and transmission electron microscope (TEM) were used for microstructural characterization. The ball-on-disc nanotribometer served for wear and friction tests applying low sliding speeds (6, 8 and 10 mm/s) at constant load (1 N). The objective of the paper was to investigate the effect of different processing techniques on microstructure, thermal stability and the tribological characteristics of composites and copper ingot alloy. Nano-sized Al2O3 particles (less than 100 nm in size) are present not only in the copper matrix of Cu-2.5 wt.% Al composite, obtained by internal oxidation, but they are also formed at the grain boundaries preventing the grain growth and providing very small grain size. During the high temperature annealing (in the range 300-950 degrees C) composites behaved much better than the ingot alloy. The highest thermal stability showed Cu-2.5 wt.% Al composite. The pinning effect of nano-sized Al2O3 particles prevents the grain growth slowing down recrystallization of this composite up to 900 degrees C. Micro-sized Al2O3 particles in Cu-5 wt.% Al2O3 composite, processed by mechanical annealing, are not effective in preventing dislocation motion and the grain growth, whereas microstructure of Cu-0.4 wt.% Cr-0.08 wt.% Zr ingot alloy was completely recrystallized around 550 degrees C. Cu-2.5 wt.% Al composite showed the best wear resistance, approximately 2.5 times higher than that of Cu-5 wt.% Al2O3 composite. High hardness and nano-sized Al2O3 particles size combined with the fine-grain structure are the main parameters leading to the improved wear resistance of the Cu-2.5Al composite.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Surface Science
T1  - The effect of processing techniques on microstructural and tribological properties of copper-based alloys
EP  - 654
SP  - 646
VL  - 280
DO  - 10.1016/j.apsusc.2013.05.039
ER  - 

@article{
author = "Vencl, Aleksandar and Rajković, Viseslava and Zivić, Fatima and Mitrović, Slobodan and Cvijović-Alagić, Ivana and Jovanović, Milan T.",
year = "2013",
abstract = "Three copper-based alloys, i.e. two composites reinforced with Al2O3 particles and fabricated through PM route and Cu-Cr-Zr alloy processed by the vacuum melting and casting technique were the object of this investigation. Light microscope, scanning electron microscope (SEM) equipped with electron X-ray spectrometer (EDS) and transmission electron microscope (TEM) were used for microstructural characterization. The ball-on-disc nanotribometer served for wear and friction tests applying low sliding speeds (6, 8 and 10 mm/s) at constant load (1 N). The objective of the paper was to investigate the effect of different processing techniques on microstructure, thermal stability and the tribological characteristics of composites and copper ingot alloy. Nano-sized Al2O3 particles (less than 100 nm in size) are present not only in the copper matrix of Cu-2.5 wt.% Al composite, obtained by internal oxidation, but they are also formed at the grain boundaries preventing the grain growth and providing very small grain size. During the high temperature annealing (in the range 300-950 degrees C) composites behaved much better than the ingot alloy. The highest thermal stability showed Cu-2.5 wt.% Al composite. The pinning effect of nano-sized Al2O3 particles prevents the grain growth slowing down recrystallization of this composite up to 900 degrees C. Micro-sized Al2O3 particles in Cu-5 wt.% Al2O3 composite, processed by mechanical annealing, are not effective in preventing dislocation motion and the grain growth, whereas microstructure of Cu-0.4 wt.% Cr-0.08 wt.% Zr ingot alloy was completely recrystallized around 550 degrees C. Cu-2.5 wt.% Al composite showed the best wear resistance, approximately 2.5 times higher than that of Cu-5 wt.% Al2O3 composite. High hardness and nano-sized Al2O3 particles size combined with the fine-grain structure are the main parameters leading to the improved wear resistance of the Cu-2.5Al composite.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Surface Science",
title = "The effect of processing techniques on microstructural and tribological properties of copper-based alloys",
pages = "654-646",
volume = "280",
doi = "10.1016/j.apsusc.2013.05.039"
}

Vencl, A., Rajković, V., Zivić, F., Mitrović, S., Cvijović-Alagić, I.,& Jovanović, M. T.. (2013). The effect of processing techniques on microstructural and tribological properties of copper-based alloys. in Applied Surface Science
Elsevier Science Bv, Amsterdam., 280, 646-654.
https://doi.org/10.1016/j.apsusc.2013.05.039

Vencl A, Rajković V, Zivić F, Mitrović S, Cvijović-Alagić I, Jovanović MT. The effect of processing techniques on microstructural and tribological properties of copper-based alloys. in Applied Surface Science. 2013;280:646-654.
doi:10.1016/j.apsusc.2013.05.039 .

Vencl, Aleksandar, Rajković, Viseslava, Zivić, Fatima, Mitrović, Slobodan, Cvijović-Alagić, Ivana, Jovanović, Milan T., "The effect of processing techniques on microstructural and tribological properties of copper-based alloys" in Applied Surface Science, 280 (2013):646-654,
https://doi.org/10.1016/j.apsusc.2013.05.039 . .

TY  - JOUR
AU  - Bobić, Ilija
AU  - Babić, Miroslav
AU  - Vencl, Aleksandar
AU  - Bobić, Biljana
AU  - Mitrović, Slobodan
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1719
AB  - Thixocast ZA27 alloy and particulate ZA27/SiCp composites were subjected to artificial aging at 80, 120 and 160 degrees C (T5 regime). Composites with 5 and 10 vol.% SiC particles were produced via the compocasting method. The influence of the aging was investigated using different techniques. Differential scanning calorimetry was performed to reveal the presence of phases created in the thixocast ZA27 alloy and the composites. Microstructures and fracture behavior were examined by means of optical microscopy, scanning electron microscopy and X-ray diffraction. Aging processes in the matrix alloy and composites were followed using hardness measurements. A decrease in the hardness values was noticed with the increase in the aging temperature. At higher temperatures diffusion of zinc atoms from supersaturated phases in the matrix alloy was enhanced, which resulted in faster changes in the hardness. Aging processes in the composites were significantly accelerated compared to the matrix alloy, due to the presence of particulate reinforcements. The maximum in hardness was achieved for shorter time in the ZA27/SiCp composite with higher volume fraction of SiC particles.
PB  - Carl Hanser Verlag, Munich
T2  - International Journal of Materials Research
T1  - Artificial aging of thixocast ZA27 alloy and particulate ZA27/SiCp composites
EP  - 965
IS  - 10
SP  - 954
VL  - 104
DO  - 10.3139/146.110958
ER  - 

@article{
author = "Bobić, Ilija and Babić, Miroslav and Vencl, Aleksandar and Bobić, Biljana and Mitrović, Slobodan",
year = "2013",
abstract = "Thixocast ZA27 alloy and particulate ZA27/SiCp composites were subjected to artificial aging at 80, 120 and 160 degrees C (T5 regime). Composites with 5 and 10 vol.% SiC particles were produced via the compocasting method. The influence of the aging was investigated using different techniques. Differential scanning calorimetry was performed to reveal the presence of phases created in the thixocast ZA27 alloy and the composites. Microstructures and fracture behavior were examined by means of optical microscopy, scanning electron microscopy and X-ray diffraction. Aging processes in the matrix alloy and composites were followed using hardness measurements. A decrease in the hardness values was noticed with the increase in the aging temperature. At higher temperatures diffusion of zinc atoms from supersaturated phases in the matrix alloy was enhanced, which resulted in faster changes in the hardness. Aging processes in the composites were significantly accelerated compared to the matrix alloy, due to the presence of particulate reinforcements. The maximum in hardness was achieved for shorter time in the ZA27/SiCp composite with higher volume fraction of SiC particles.",
publisher = "Carl Hanser Verlag, Munich",
journal = "International Journal of Materials Research",
title = "Artificial aging of thixocast ZA27 alloy and particulate ZA27/SiCp composites",
pages = "965-954",
number = "10",
volume = "104",
doi = "10.3139/146.110958"
}

Bobić, I., Babić, M., Vencl, A., Bobić, B.,& Mitrović, S.. (2013). Artificial aging of thixocast ZA27 alloy and particulate ZA27/SiCp composites. in International Journal of Materials Research
Carl Hanser Verlag, Munich., 104(10), 954-965.
https://doi.org/10.3139/146.110958

Bobić I, Babić M, Vencl A, Bobić B, Mitrović S. Artificial aging of thixocast ZA27 alloy and particulate ZA27/SiCp composites. in International Journal of Materials Research. 2013;104(10):954-965.
doi:10.3139/146.110958 .

Bobić, Ilija, Babić, Miroslav, Vencl, Aleksandar, Bobić, Biljana, Mitrović, Slobodan, "Artificial aging of thixocast ZA27 alloy and particulate ZA27/SiCp composites" in International Journal of Materials Research, 104, no. 10 (2013):954-965,
https://doi.org/10.3139/146.110958 . .