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Precipitate phase transformation behavior, microstructure, and properties of Cu–Cr–Co–Si alloy

Published online by Cambridge University Press:  10 February 2020

Xinglong Sun ,
Jinchuan Jie ,
Tongmin Wang  and
Tingju Li
Xinglong Sun
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Jinchuan Jie*
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Tongmin Wang
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Tingju Li
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, precipitate phase transformation behavior, microstructure, and properties of the Cu–1Cr–1Co–0.4Si (wt%) alloy were investigated. Precipitate phase transformation kinetic equations of the alloy under room temperature rolling (RTR) 90% deformation and aging at different temperatures (440–520 °C) were established. The alloy yielded excellent mechanical and electrical properties under RTR 90% deformation and aging at 440 °C for 1 h, and the corresponding hardness, yield strength (YS), ultimate tensile strength (UTS), elongation, and electrical conductivity were 181.6 HV, 573.6 MPa, 653.7 MPa, 7.3%, and 51.6% International Annealed Copper Standard, respectively. The precipitate phase transformation behavior determined the size and volume fraction of the precipitate phase fv, which played a key role in improving the YS. Impurity scattering caused by surplus Si atoms was mainly responsible for decreasing the electrical conductivity. Therefore, these results can provide a reliable theoretical guidance to prepare Cu–Cr–based alloys with high strength and high electrical conductivity.

Keywords

Cu–1Cr–1Co–0.4Si alloyprecipitate phase transformation behaviormicrostructureyield strengthelectrical conductivity
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 6 , 30 March 2020 , pp. 623 - 632
Copyright
Copyright © Materials Research Society 2020

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