Journal
JOURNAL OF MATERIALS RESEARCH
Volume 35, Issue 20, Pages 2746-2755Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/jmr.2020.198
Keywords
Cu– Cr– Zr alloy; properties; low-energy cyclic impact; microstructure; micro-alloying; solution and aging
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Funding
- Xi'an Science Research Project of China [2020KJRC0089]
- Electrical Materials and Infiltration Key Laboratory of Shaanxi Province Projects [17JS080]
- Newton Mobility Grant through Royal Society [IE161019]
- National Natural Science Foundation of China
- Royal Academy of Engineering UK-Research Exchange with China and India
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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.
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