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Microstructure evolution and enhanced properties of Cu–Cr–Zr alloys through synergistic effects of alloying, heat treatment and low-energy cyclic impact

Published online by Cambridge University Press:  04 August 2020

Fanglong Yan ,
Wenge Chen ,
Pei Feng ,
Longlong Dong ,
Tao Yang ,
Shuxin Ren  and
Yongqing Fu
Fanglong Yan
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Wenge Chen*
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Pei Feng
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Longlong Dong
Affiliation:
Advanced Materials Research Central, Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China
Tao Yang
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Shuxin Ren
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Yongqing Fu*
Affiliation:
Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1.8ST, UK
*
a)Address all correspondence to these authors. e-mail: wgchen001@263.net
b)e-mail: richard.fu@northumbria.ac.uk
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Abstract

In this paper, CuCr–Zr alloys prepared by vacuum melting with adding La and Ni elementswere heat-treated and aged, followed by plastic deformation using low-energy cyclic impact tests, to simultaneously improve their mechanical and electrical properties. Results showed that the grain size of the casted Cu–Cr–Zr alloys was significantly reduced after the solid-solution aging and plastic deformation process. There were a lot of dispersed Cr and Cu5Zr precipitates formed in the alloys, and the numbers of dislocations were significantly increased. Accordingly, the hardness was increased from 78 to 232 HV, and the tensile strength was increased from 225 to 691 MPa. Electrical conductivity has not been significantly affected after these processes. The enhancement of overall performance is mainly attributed to the combined effects of solid-solution hardening, fine grain hardening, and precipitation/dislocation strengthening.

Keywords

Cu–Cr–Zr alloypropertieslow-energy cyclic impactmicrostructuremicro-alloyingsolution and aging

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Article
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Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2746 - 2755
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Copyright © Materials Research Society 2020

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