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Evidence for an early softening behavior in pure copper processed by high-pressure torsion

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Abstract

Pure copper of 99.99 % purity was processed by high-pressure torsion under a pressure of 6.0 GPa at room temperature through various numbers of turns from 1/4 to 10. Microhardness measurements show that the hardness initially increases to a maximum value at a strain of ~5.6, decreases to a strain of ~8.4, and then increases slowly to a saturation condition at strains at and above ~80. These data are interpreted in terms of the advent of dynamic recrystallization. The results have similarities and differences to the softening with recovery that is well established in high-purity aluminum.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 51375111 and 51475124, the National Science Foundation of the United States under Grant No. DMR-1160966, and the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS. Partial support was also provided by the National Basic Research Program of China under Grant No. 2012CB934100.

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Authors and Affiliations

  1. Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China

    Jie Xu, Jianwei Li, Debin Shan & Bin Guo

  2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Jie Xu, Jianwei Li, Debin Shan & Bin Guo

  3. School of Mechanical Engineering, Nanjing University of Science &Technology, Nanjing, 210094, China

    Chuan Ting Wang

  4. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Terence G. Langdon

  5. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK

    Terence G. Langdon

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  1. Jie Xu
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Correspondence to Bin Guo or Terence G. Langdon.

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Xu, J., Li, J., Wang, C.T. et al. Evidence for an early softening behavior in pure copper processed by high-pressure torsion. J Mater Sci 51, 1923–1930 (2016). https://doi.org/10.1007/s10853-015-9499-6

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  • DOI: https://doi.org/10.1007/s10853-015-9499-6

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