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Effect of Heat Treatment on the Microstructure and Properties of Deformation-Processed Cu-7Cr In Situ Composites

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Abstract

The effect of heat treatment on the microstructure, electrical conductivity, and tensile strength of deformation-processed Cu-7Cr in situ composites produced by thermo-mechanical processing was investigated. The Cr fibers in the Cu-7Cr in situ composite underwent coarsening, break-up, and spheroidization after exposure to elevated temperatures. The conductivity and tensile strength of the in situ composite first increased with increasing isochronal heat treatment temperature, reached a peak value, and decreased at higher temperatures. The isothermal heat treatment temperature was determined to be 625 °C. The Z (Z is an optimization parameter to evaluate the service performance of deformation-processed Cu-based in situ composites) value of the deformation-processed Cu-7Cr in situ composite, at η = 7 (η is a cumulative cold deformation strain) after the heat treatment at 625 °C for 1 h, reached the peak value of 3.46 × 107 MPa2 % International Annealed Copper Standard (IACS). The isochronal heat treatment time was determined to be 1 h. The following combination of conductivity and tensile strength of the deformation-processed Cu-7Cr in situ composite with a cumulative cold deformation strain of eight after isochronal aging treatments for 1 h could be attained respectively as (i) 76.0% IACS and 889 MPa; (ii) 76.8% IACS and 876 MPa; or (iii) 77.5% IACS and 779 MPa.

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Acknowledgments

This project was supported by the National Natural Science Foundation of China (51461018), the International Science and Technology Cooperation Project of Jiangxi Province (20151BDH80006), the Key Program of Natural Science Foundation of Jiangxi Province (20133BAB20008; 20144ACB20013), the Science and Technology Innovation Team Project of Jiangxi Province (20115BCB29018), and the China Scholarship Council (2011836024).

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Authors and Affiliations

  1. Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang, 330029, People’s Republic of China

    Keming Liu, Deping Lu & Yanling Yang

  2. School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Keming Liu & Zhengyi Jiang

  3. School of Materials Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Haitao Zhou

  4. Division of Materials Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia

    Andrej Atrens

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  1. Keming Liu
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Correspondence to Keming Liu or Zhengyi Jiang.

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Liu, K., Jiang, Z., Zhou, H. et al. Effect of Heat Treatment on the Microstructure and Properties of Deformation-Processed Cu-7Cr In Situ Composites. J. of Materi Eng and Perform 24, 4340–4345 (2015). https://doi.org/10.1007/s11665-015-1747-z

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  • DOI: https://doi.org/10.1007/s11665-015-1747-z

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