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The microstructure evolution and properties of a Cu–Cr–Ag alloy during thermal-mechanical treatment

Published online by Cambridge University Press:  07 February 2017

Yue Liu ,
Zhou Li ,
Yexin Jiang ,
Yang Zhang ,
Zheyuan Zhou  and
Qian Lei
Yue Liu
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zhou Li*
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Yexin Jiang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Yang Zhang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zheyuan Zhou
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Qian Lei*
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China; and Department of Materials Science and Engineering, College of Engineering, University of Michigan, Ann Arbor 48109-2136, USA
*
a) Address all correspondence to these authors. e-mail: lizhou6931@csu.edu.cn
b) e-mail: qianlei@umich.edu
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Abstract

A Cu–0.13Cr–0.074Ag (wt%) alloy has been synthesized by the nonvacuum melting and casting followed by thermal-mechanical treatment, and microstructure and mechanical properties have been tailored to make a trade-off between the strength and the electrical conductivity. Results illuminated that the designed alloy has a tensile strength of 473 MPa, a hardness of 140 HV, a yield strength of 446 MPa, an elongation of 10.5%, and an electrical conductivity of 94.5% IACS. Microstructure observations of the samples aged at 480 °C showed that: an fcc structure Cr-phase with a cube-on-cube orientation relationship with the Cu matrix was formed as aged for 15 min, while an ordered bcc structure Cr phase with B2 structure formed as aged for 2 h. The 3DAP results revealed that the Cr was formed to be precipitates and the Ag was formed as solutes distributing evenly in matrix. The high electrical conductivity was ascribed to the Cr element precipitated from the Cu matrix, Ag dissolved in the Cu matrix had little effect on the scattering of Cu electron.

Keywords

Cu–Cr–Ag alloythermal-mechanical treatmentCr phasemicrostructurestrength
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1324 - 1332
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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