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Effects of Route on Microstructural Evolution and Mechanical Properties of Cu-8 Wt Pct Ag Alloy Processed by Equal Channel Angular Pressing

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Abstract

Equal channel angular pressing (ECAP) is applied to investigate the microstructural evolution and mechanical properties of Cu-8 wt pct Ag alloy subjected to one to four passes via four different routes (A, BA, BC, and C). It is demonstrated that better mechanical properties, a higher fraction of high-angle boundaries, and a smaller grain size can be obtained most rapidly with route A, whereas the specimen processed by route BC contains relatively inhomogeneous microstructure and has poor mechanical properties. The ultimate tensile stress (UTS) of the Cu-Ag alloy processed by route BC saturates after four passes; in contrast, the UTS of the Cu-Ag alloy processed by route A increases continuously in relation to the number of ECAP passes. Based on the experimental results, the strengthening mechanisms of the Cu-8 wt pct Ag alloy processed by different routes as well as the efficiency of different routes in refining the binary alloy are discussed.

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Acknowledgments

The authors are grateful for the impressive discussions with Professors T.G. Langdon, M.A. Meyers, and H. Mughrabi during their visit in IMR. Mr. L.F. Cheng, P. Zhang, X.H. An, and Ms. W. Gao also are acknowledged for their help with casting the Cu-Ag alloy, conducting the ECAP experiments, and SEM observations. This work is supported financially by National Natural Science Foundation of China (NSFC) under Grant 50890173 and 50931005 and the National Outstanding Young Scientist Foundation under Grant 50625103.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    Yan-Zhong Tian (Doctor), Qi-Qiang Duan (Engineer), Hua-Jie Yang (Doctor), He-Fei Zou (Doctor), Shi-Ding Wu (Professor) & Zhe-Feng Zhang (Professor)

  2. Central Iron and Steel Research Institute, Beijing, 100081, P.R. China

    Gang Yang (Professor)

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  1. Yan-Zhong Tian
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Correspondence to Zhe-Feng Zhang.

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Manuscript submitted October 2, 2009.

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Tian, YZ., Duan, QQ., Yang, HJ. et al. Effects of Route on Microstructural Evolution and Mechanical Properties of Cu-8 Wt Pct Ag Alloy Processed by Equal Channel Angular Pressing. Metall Mater Trans A 41, 2290–2303 (2010). https://doi.org/10.1007/s11661-010-0313-4

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