Simultaneous enhancement of mechanical and electrical properties of Cu-Ni-Si alloys via thermo-mechanical process

被引:43
作者
Wang, Changsheng [1 ]
Fu, Huadong [1 ,2 ,3 ]
Zhang, Hongtao [1 ]
He, Xingqun [1 ]
Xie, Jianxin [1 ,2 ,3 ]
机构
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
[2] Inst Adv Mat & Technol, Beijing Lab Metall Mat & Proc Modern Transportat, Beijing 100083, Peoples R China
[3] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Key Lab Adv Mat Proc, Minist Educ, Beijing 100083, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 838卷
基金
中国国家自然科学基金;
关键词
Thermo-mechanical treatment; Cu-Ni-Si alloy; Precipitation strengthening; Microstructure; HIGH-STRENGTH; CR ALLOY; MICROSTRUCTURE; CONDUCTIVITY; IMPROVEMENT; HARDNESS; TENSILE;
D O I
10.1016/j.msea.2022.142815
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Developing high-performance copper alloys while simultaneously improving ultimate tensile strength (UTS) and electrical conductivity (EC) has been a key challenge and direction. Two thermo-mechanical processes were employed in this study to achieve simultaneous enhancement of UTS and EC of the Cu-3.08Ni-0.61Si-0.17Zn0.17Cr-0.04P alloy. After the two-stage cold-rolling and aging process (85% cold-rolling + 450 degrees C@60 min aging + 95% cold-rolling + 450 degrees C@30 min aging, referred to as Process A), the alloy's UTS and EC of the alloy are 856 +/- 26 MPa and 52.4 +/- 0.8% international annealed copper standard (IACS). The mechanical and electrical properties of the alloy with process A are much better than those of the alloy with single stage cold-rolling and aging treatment process (85% cold-rolling + 450@60 min aging, 786 +/- 12 MPa, 47.5 +/- 0.9% IACS). The UTS of the alloy reaches 905 +/- 11 MPa with pre-aging + two-stage cold-rolling-aging (450 degrees C@90 min pre-aging + process A, referred to as process B), and the EC reaches 52.5 +/- 0.2% IACS, indicating that process B enhanced the strength over process A. A large number of nano-scale delta-Ni2Si precipitates are observed in the samples after primary aging of process A and pre-aging of process B, leading to a more diffuse dislocation distribution during subsequent cold-rolling and then promoting further precipitation of the solute atoms during subsequent aging processes. In the samples treated by both process A and B, there are two sizes of delta-Ni2Si phase precipitates, simultaneously enhancing UTS and EC of the Cu-Ni-Si alloy.
引用
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页数:12
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