Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 3    March 2021

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Effects of Ni content on microstructure and properties of aged Cu-0.4Be alloy
Yan-bin JIANG1,2, Tong-tong ZHANG2, Yu LEI2, Shuang-jiang HE2, Xin-hua LIU2,3, Jian-xin XIE2,3

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory for Advanced Materials Processing (Ministry of Education), University of Science and Technology Beijing, Beijing 100083, China;
3. Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract:The effects of Ni content (0-2.10 wt.%) on the precipitated phase, strength and electrical conductivity of Cu-0.4wt.%Be alloy were investigated, and the influencing mechanism was analyzed. The results showed that the addition of Ni promoted the precipitation of strengthening phase in the alloy and remarkably enhanced the strengthening effect. When the Ni content was increased from 0 to 2.10 wt.%, the strength of the aged alloy initially increased and then decreased, and approached the maximum when the Ni content was 1.50 wt.%. The peak-aging parameters of the alloy containing 1.50 wt.% Ni were the aging temperature of 400 °C and the aging time of 60 min, where the tensile strength and yield strength of the aged alloy were 611 and 565 MPa, respectively, which were 2.8 times and 6.1 times those of the alloy without Ni. The electrical conductivity of the alloy with Ni increased with the aging time, and decreased with the increase of Ni content. With an increase of the aging time at 400 °C, phase transition sequence of the Cu-0.4Be-1.5Ni alloy was γ″ phase →γ′ phase →γ phase. For the aging time of 60 min, a large number of dispersed nano-scale coherent γ″ phase and γ′ phase formed in the alloy with a remarkable strengthening effect, which was mainly responsible for the high strength of the alloy.

 

Key words: Cu-Be alloy; alloying; phase transformation; microstructure; mechanical properties; electrical conductivity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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