Development of the precipitation and dispersion hardened powder metallurgy Cu-Ni-Si-Cr + Al2O3 alloy

作者：Wang Huei Sen^*; Chen Hou Guang; Hsu Cheng En; Wu Chung Yung

来源：Journal of Alloys and Compounds, 2017, 728: 1157-1164.

DOI：10.1016/j.jallcom.2017.09.132

• Copper alloy
• Powder metallurgy
• Heat treatment
• Precipitation and dispersion hardening
• Microstructure
• Thermal and mechanical properties

A Cu-Ni-Si-Cr + Al2O3 alloy, which combines the precipitation and dispersion hardening of the alloy, were produced by using the powder metallurgy (P/M) technique. To obtain the optimal properties of the alloy, a series of solution and aging treatments were conducted. Following heat treatments, the microstructural, thermal and mechanical properties of P/M produced Cu-Ni-Si-Cr + Al2O3 alloy were investigated. The microstructural investigation indicates that the as hot-forged P/M Cu-Ni-Si-Cr + Al2O3 alloy consists of Cu-Ni-Si-Cr powder (considered as grain A) and Cu-Al2O3 powder (considered as grain B). After heat treatments, it is observed that massive Ni and minor Si elements from grain A diffuse to grain B and react with each other, resulting in the formation of the beta-Ni3Si strengthening phases in both grains. Also, Al2O3 dispersoids, which disperse in grain B, provide the high thermal stability in grain size. Therefore, the P/M-produced copper alloy developed in this study has a combination of the better thermal stability in relation to grain size, high strength or hardness and high thermal conductivity, which offers possible applications at elevated temperatures.

• 出版日期2017-12-25