銅と銅合金
Online ISSN : 2435-872X
Print ISSN : 1347-7234
機械的性質
A Trade–off between Mechanical Strength and Conductivity in Oxide Dispersion–Strengthened–Cu Alloys Fabricated by Mechanical Alloying
Yuchen LiuRyuta KasadaZimo GaoHideaki YaoSosuke KondoHao YuSatoshi KonishiMohammad AghamiriNaoko OonoShigeharu UkaiHiroyuki NotoYoshimitsu HishinumaTakeo Muroga
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2023 年 62 巻 1 号 p. 152-157

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A trade–off between mechanical strength and thermal conductivity prevents the achievement of higher thermal conductivity in copper alloys, while maintaining the high mechanical strength of copper at high temperatures, which can result in energy savings and a lower carbon footprint. Oxide dispersion–strengthened (ODS) Cu–xY2O3 (x=0, 0.5, 1, 2 wt%) alloys were prepared by mechanical alloying (MA) using a water–cooled high–energy ball milling machine and then sintered with a hot press. The indentation hardness of the sintered materials increased with the amount of Y2O3. Microstructural observations revealed that high strengths for the Cu– Y2O3 ODS alloys was achieved by both oxide dispersion and fine grains. However, the thermal diffusivity was not simply dependent on the amount of Y2O3, which was higher in both Cu–0Y2O3 and Cu–1Y2O3 but lower in the others. Among the factors affecting the thermal diffusivity, the amount of impurities, such as Fe and Cr, introduced during the MA process are responsible for the higher values of thermal diffusivity in Cu–0Y2O3 and Cu–1Y2O3. The obtained results indicate that ODS–Cu alloys fabricated by MA and sintering can overcome the trade–off between mechanical strength and thermal conductivity when the solute impurities are suppressed.

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© 2023 Japan Institute of Copper
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