TY  - JOUR
AU  - Ružić, Jovana
AU  - Stašić, Jelena M.
AU  - Rajković, Višeslava M.
AU  - Raić, Karlo
AU  - Božić, Dušan
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5792
AB  - The Cu-7vol.%ZrB2 alloy examined in this study was consolidated via powder metallurgy (PM) processing by combining mechanical alloying and hot pressing. Powder mixture with composition: 94.78 wt.% copper, 4.1 wt.% zirconium, and 1.12 wt.% boron was used as a starting material. Mechanical alloying of powder mixture was performed at various times: 5, 10, 15, 20, 25, and 30 h. Structural changes that occur in the samples of copper alloy with 7vol.%ZrB2 after milling and during hot pressing process were studied with the use of X-ray diffraction. Scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometry (EDS) was applied to examine the morphological properties and elemental analysis of the hot-pressed samples as a function of milling times. Also, hardness of the Cu-7vol.%ZrB2 alloy was investigated, and the results showed that hardness of the samples increased as the milling time increased. The compressive properties at room temperature are correlated to the corresponding hardness results. Distribution of ZrB2 particles and presence of agglomerates in the Cu matrix directly depend on the milling time and show strong influence on compressive properties and fracture of Cu7vol.%ZrB2 alloy.
PB  - Walter de Gruyter GmbH
T2  - Science and Engineering of Composite Materials
T1  - Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques
EP  - 671
IS  - 6
SP  - 665
VL  - 22
DO  - 10.1515/secm-2013-0178
ER  - 

@article{
author = "Ružić, Jovana and Stašić, Jelena M. and Rajković, Višeslava M. and Raić, Karlo and Božić, Dušan",
year = "2015",
abstract = "The Cu-7vol.%ZrB2 alloy examined in this study was consolidated via powder metallurgy (PM) processing by combining mechanical alloying and hot pressing. Powder mixture with composition: 94.78 wt.% copper, 4.1 wt.% zirconium, and 1.12 wt.% boron was used as a starting material. Mechanical alloying of powder mixture was performed at various times: 5, 10, 15, 20, 25, and 30 h. Structural changes that occur in the samples of copper alloy with 7vol.%ZrB2 after milling and during hot pressing process were studied with the use of X-ray diffraction. Scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometry (EDS) was applied to examine the morphological properties and elemental analysis of the hot-pressed samples as a function of milling times. Also, hardness of the Cu-7vol.%ZrB2 alloy was investigated, and the results showed that hardness of the samples increased as the milling time increased. The compressive properties at room temperature are correlated to the corresponding hardness results. Distribution of ZrB2 particles and presence of agglomerates in the Cu matrix directly depend on the milling time and show strong influence on compressive properties and fracture of Cu7vol.%ZrB2 alloy.",
publisher = "Walter de Gruyter GmbH",
journal = "Science and Engineering of Composite Materials",
title = "Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques",
pages = "671-665",
number = "6",
volume = "22",
doi = "10.1515/secm-2013-0178"
}

Ružić, J., Stašić, J. M., Rajković, V. M., Raić, K.,& Božić, D.. (2015). Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques. in Science and Engineering of Composite Materials
Walter de Gruyter GmbH., 22(6), 665-671.
https://doi.org/10.1515/secm-2013-0178

Ružić J, Stašić JM, Rajković VM, Raić K, Božić D. Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques. in Science and Engineering of Composite Materials. 2015;22(6):665-671.
doi:10.1515/secm-2013-0178 .

Ružić, Jovana, Stašić, Jelena M., Rajković, Višeslava M., Raić, Karlo, Božić, Dušan, "Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques" in Science and Engineering of Composite Materials, 22, no. 6 (2015):665-671,
https://doi.org/10.1515/secm-2013-0178 . .

TY  - JOUR
AU  - Rajković, Višnja
AU  - Božić, Dušan
AU  - Popović, Miljana
AU  - Jovanović, Milan
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7299
AB  - Copper-based composites were obtained using high energy milling. The inert gas-atomized prealloyed copper powder (average particle size - 30 μm) containing 2 wt.% Al, and the mixture of electrolytic copper powder (average particle size – 30 and 15 μm) with 4 wt.% comertial Al2O3 powders (average particle size –0.75μm) served as starting materials. These powders were separately milled in air up to 20 h in the planetary ball mill. Milling of prealloyed copper powder promotes formation of nano-sized Al2O3 particles by internal oxidation with oxygen from air. It was calculated that by internal oxidation of 2 wt.% aluminum approximately 3.7 wt.% Al2O3 was generated in the copper matrix. Milled powders were treated in hydrogen at 400 °C for 1 h in order to eliminate copper oxides formed at the surface during milling. Compaction executed by hot-pressing was carried out in an argon atmosphere at 800 °C for 1 h under the pressure of 35 MPa. Compacts obtained from 5 and 20 h milled powders were additionally subjected to high-temperature exposure in argon at 800 °C for 1 and 5 h. The results were discussed in terms of the effects of different size of starting powder particles on structure, strengthening of copper matrix, thermal stability and electrical conductivity of the Cu - Al2O3 composite.
PB  - Savez inženjera metalurgije Srbije
T2  - Metalurgija
T1  - Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling
EP  - 52
IS  - 1
SP  - 45
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7299
ER  - 

@article{
author = "Rajković, Višnja and Božić, Dušan and Popović, Miljana and Jovanović, Milan",
year = "2009",
abstract = "Copper-based composites were obtained using high energy milling. The inert gas-atomized prealloyed copper powder (average particle size - 30 μm) containing 2 wt.% Al, and the mixture of electrolytic copper powder (average particle size – 30 and 15 μm) with 4 wt.% comertial Al2O3 powders (average particle size –0.75μm) served as starting materials. These powders were separately milled in air up to 20 h in the planetary ball mill. Milling of prealloyed copper powder promotes formation of nano-sized Al2O3 particles by internal oxidation with oxygen from air. It was calculated that by internal oxidation of 2 wt.% aluminum approximately 3.7 wt.% Al2O3 was generated in the copper matrix. Milled powders were treated in hydrogen at 400 °C for 1 h in order to eliminate copper oxides formed at the surface during milling. Compaction executed by hot-pressing was carried out in an argon atmosphere at 800 °C for 1 h under the pressure of 35 MPa. Compacts obtained from 5 and 20 h milled powders were additionally subjected to high-temperature exposure in argon at 800 °C for 1 and 5 h. The results were discussed in terms of the effects of different size of starting powder particles on structure, strengthening of copper matrix, thermal stability and electrical conductivity of the Cu - Al2O3 composite.",
publisher = "Savez inženjera metalurgije Srbije",
journal = "Metalurgija",
title = "Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling",
pages = "52-45",
number = "1",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7299"
}

Rajković, V., Božić, D., Popović, M.,& Jovanović, M.. (2009). Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling. in Metalurgija
Savez inženjera metalurgije Srbije., 15(1), 45-52.
https://hdl.handle.net/21.15107/rcub_technorep_7299

Rajković V, Božić D, Popović M, Jovanović M. Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling. in Metalurgija. 2009;15(1):45-52.
https://hdl.handle.net/21.15107/rcub_technorep_7299 .

Rajković, Višnja, Božić, Dušan, Popović, Miljana, Jovanović, Milan, "Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling" in Metalurgija, 15, no. 1 (2009):45-52,
https://hdl.handle.net/21.15107/rcub_technorep_7299 .