Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying
Apstrakt
The copper matrix has been dispersion strengthened with 3wt. %Al2O3 by mechanical alloying. Commercial alumina powder with an average particle size of 0.751 mum was used for alloying. The mechanical alloying process was performed in a planetary ball mill up to 20h in air. After milling all powders were treated in H-2 at 400(degrees)C for 1h, and finally hot pressing was used for compaction (800degreesC, 3h, Ar). Structure observations revealed a lamellar structure (Al2O3 particles largely restricted to interlamellar planes between adjacent copper lamellae) accompanied also by structure refinement. These structural changes were mostly completed in the early stage of milling, and retained after compaction. Micro. hardness was found to progressively increase with milling time. So, after 5h of milling the micro hardness of the Cu+3twt%Al2O3 compact was 1540MPa, i.e. 2.5 times greater than for the as-received electrolytic copper powder (638MPa) compacted under identical conditions, while af...ter 20h of milling it was 2370 MPa. However, after exposing the tested compact at 800degreesC up to 5h, the achieved hardening effect vanished.
Ključne reči:
dispersion strengthened copper / mehanical alloying / microhardnessIzvor:
Science of Sintering, 2004, 36, 3, 205-211
DOI: 10.2298/SOS0403205R
ISSN: 0350-820X
WoS: 000226989600008
Scopus: 2-s2.0-40049084671
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Rajković, Višeslava M. AU - Eric, O AU - Božić, Dušan AU - Mitkov, Mirjana V. AU - Romhanji, E PY - 2004 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2855 AB - The copper matrix has been dispersion strengthened with 3wt. %Al2O3 by mechanical alloying. Commercial alumina powder with an average particle size of 0.751 mum was used for alloying. The mechanical alloying process was performed in a planetary ball mill up to 20h in air. After milling all powders were treated in H-2 at 400(degrees)C for 1h, and finally hot pressing was used for compaction (800degreesC, 3h, Ar). Structure observations revealed a lamellar structure (Al2O3 particles largely restricted to interlamellar planes between adjacent copper lamellae) accompanied also by structure refinement. These structural changes were mostly completed in the early stage of milling, and retained after compaction. Micro. hardness was found to progressively increase with milling time. So, after 5h of milling the micro hardness of the Cu+3twt%Al2O3 compact was 1540MPa, i.e. 2.5 times greater than for the as-received electrolytic copper powder (638MPa) compacted under identical conditions, while after 20h of milling it was 2370 MPa. However, after exposing the tested compact at 800degreesC up to 5h, the achieved hardening effect vanished. T2 - Science of Sintering T1 - Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying VL - 36 IS - 3 SP - 205 EP - 211 DO - 10.2298/SOS0403205R ER -
@article{ author = "Rajković, Višeslava M. and Eric, O and Božić, Dušan and Mitkov, Mirjana V. and Romhanji, E", year = "2004", abstract = "The copper matrix has been dispersion strengthened with 3wt. %Al2O3 by mechanical alloying. Commercial alumina powder with an average particle size of 0.751 mum was used for alloying. The mechanical alloying process was performed in a planetary ball mill up to 20h in air. After milling all powders were treated in H-2 at 400(degrees)C for 1h, and finally hot pressing was used for compaction (800degreesC, 3h, Ar). Structure observations revealed a lamellar structure (Al2O3 particles largely restricted to interlamellar planes between adjacent copper lamellae) accompanied also by structure refinement. These structural changes were mostly completed in the early stage of milling, and retained after compaction. Micro. hardness was found to progressively increase with milling time. So, after 5h of milling the micro hardness of the Cu+3twt%Al2O3 compact was 1540MPa, i.e. 2.5 times greater than for the as-received electrolytic copper powder (638MPa) compacted under identical conditions, while after 20h of milling it was 2370 MPa. However, after exposing the tested compact at 800degreesC up to 5h, the achieved hardening effect vanished.", journal = "Science of Sintering", title = "Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying", volume = "36", number = "3", pages = "205-211", doi = "10.2298/SOS0403205R" }
Rajković, V. M., Eric, O., Božić, D., Mitkov, M. V.,& Romhanji, E.. (2004). Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying. in Science of Sintering, 36(3), 205-211. https://doi.org/10.2298/SOS0403205R
Rajković VM, Eric O, Božić D, Mitkov MV, Romhanji E. Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying. in Science of Sintering. 2004;36(3):205-211. doi:10.2298/SOS0403205R .
Rajković, Višeslava M., Eric, O, Božić, Dušan, Mitkov, Mirjana V., Romhanji, E, "Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying" in Science of Sintering, 36, no. 3 (2004):205-211, https://doi.org/10.2298/SOS0403205R . .