Effect of Al content on microstructure and properties of Cu-Be-Ni alloy

被引：0
作者：
Wang F. [1 ,2 ]
Jiang Y.-B. [1 ,2 ]
Zhang Z.-H. [2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing
[3] Key Laboratory for Advanced Materials Processing, Ministry of Education, University of Science and Technology Beijing, Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 05期
关键词：
Aluminium alloying; Beryllium copper alloy; Elastic modulus; Microstructure; Solid solution aging;
D O I：
10.11817/j.ysxb.1004.0609.2021-37791
中图分类号：
学科分类号：
摘要：
Adding other alloying elements for partial replacement of beryllium is one of the research hotspots of low-cost and high-performance beryllium copper. The effects of 0-0.2% Al content on the microstructure and properties of Cu-0.3Be-2.0Ni alloy and its mechanism were studied. The results show that, as the Al content increasing, the grain size of the cast sample decreases and the number of precipitated phase increases. When the Al contents are 0.1% and 0.15%, the needle-like Ni3Al phase precipitates inside the grains, which is mainly distributed in the interdendritic area. When the Al content increases to 0.2%, a large number of needle-like phases form inside grains, and a rod-shaped Ni3Al phase with a chain distribution forms at grain boundaries. Addition of Al improves the elastic modulus of the alloy. When the Al content increases from 0 to 0.2%, the elastic modulus increases from 115 GPa to 127 GPa, increased by 10%. The Ni3Al phase formed by Al and Ni with high elastic modulus is the main reason for the increase of elastic modulus. The peak hardness and electrical conductivity of Cu-0.3Be-2.0 Ni alloy containing 0.2% Al after conventional aging are 238HV and 44%IACS, respectively, whose hardness is increased by 6%, the overaging resistance is improved and the electrical conductivity is decreased by 6%IACS comparing with the alloy without Al. © 2021, Science Press. All right reserved.
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页码：1261 / 1269
页数：8
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