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Effect of heat treatment on the microstructure and properties of deformation-processed Cu-7Cr in situ composites

Journal Article


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.

UOW Authors


  •   Liu, Keming (external author)
  •   Jiang, Zhengyi
  •   Zhou, Haitao (external author)
  •   Lu, Deping (external author)
  •   Atrens, Andrejs (external author)
  •   Yang, Yanling (external author)

Publication Date


  • 2015

Citation


  • Liu, K., Jiang, Z., Zhou, H., Lu, D., Atrens, A. & Yang, Y. (2015). Effect of heat treatment on the microstructure and properties of deformation-processed Cu-7Cr in situ composites. Journal of Materials Engineering and Performance, 24 4340-4345.

Scopus Eid


  • 2-s2.0-84946532482

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4814

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 4340

End Page


  • 4345

Volume


  • 24

Place Of Publication


  • United States

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.

UOW Authors


  •   Liu, Keming (external author)
  •   Jiang, Zhengyi
  •   Zhou, Haitao (external author)
  •   Lu, Deping (external author)
  •   Atrens, Andrejs (external author)
  •   Yang, Yanling (external author)

Publication Date


  • 2015

Citation


  • Liu, K., Jiang, Z., Zhou, H., Lu, D., Atrens, A. & Yang, Y. (2015). Effect of heat treatment on the microstructure and properties of deformation-processed Cu-7Cr in situ composites. Journal of Materials Engineering and Performance, 24 4340-4345.

Scopus Eid


  • 2-s2.0-84946532482

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4814

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 4340

End Page


  • 4345

Volume


  • 24

Place Of Publication


  • United States