Effect of thermomechanical treatment on microstructure and properties of Cu-Cr-Zr-Ag alloy |
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Authors: | Haofeng Xie Xujun Mi Guojie Huang Baodong Gao Xiangqian Yin Yanfeng Li |
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Affiliation: | XIE Haofeng,MI Xujun,HUANG Guojie,GAO Baodong,YIN Xiangqian,and LI Yanfeng State Key Laboratory of Nonferrous Metals and Processes,General Research Institute for Nonferrous Metals,Beijing 100088,China |
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Abstract: | The effects of thermomechanical treatment on the properties and microstructure of Cu-Cr-Zr alloy and Cu-Cr-Zr-Ag alloy were
investigated. Ag addition improves the mechanical properties of the alloy through solid solution strengthening and brings
a little effect on the electrical conductivity of the alloy. A new Cu-Cr-Zr-Ag alloy was developed, which has an excellent
combination of the tensile strength, elongation, and electrical conductivity reaching 476.09 MPa, 15.43% and 88.68% IACS respectively
when subjected to the optimum thermomechanical treatment, i.e., solution-treating at 920°C for 1 h, cold drawing to 96% deformation,
followed by aging at 400°C for 3 h. TEM analysis revealed two kinds of finely dispersed precipitates of Cr and Cu4Zr. It is very important to use the mechanisms of solid solution strengthening, work hardening effect as well as precipitate
pinning effect of dislocations to improve tensile strength of the alloy without adversely affecting its electrical conductivity. |
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Keywords: | Cu-Cr-Zr-Ag alloy thermomechanical treatment microstructure tensile strength electrical conductivity |
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