Deformation behavior of biomedical Co-Cr-Mo alloy

Hiroaki Matsumoto, Shingo Kurosu, Byoung Soo Lee, Yunping Li, Yuichiro Koizumi, Akihiko Chiba

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Cobalt-chromium-molybdenum (Co-Cr-Mo)-based alloys have been used as many kinds of biomedical applications due to their excellent biocompatibility and mechanical properties. The deformation behaviors of Co-27%Cr-5.5%Mo-0.16%N alloy (in mass%) consisting of γ phase (fcc) and Co-27%Cr-5%Mo alloy consisting of ε phase (hcp) were summarized in this study. Stacking fault formation followed by evolution to ε phase with increasing strain was dominant deformation mode in γ Co-27%Cr-5.5%Mo-0.16%N alloy. Excellent tensile ductility at room temperature more than 20% was seen in γ Co-27%Cr-5.5%Mo-0.16%N alloy. However, fracture occurred under quasi-brittle manner. Then, crack propagated preferentially at interface between γ phase and strain induced ε phase, which is due to the highly-accumulated strain at the interface. While, in ε Co-27%Cr-5%Mo alloy, simultaneous activation of basal 〈a〉 slip and prismatic 〈a〉 slip is dominant deformation mode, and fracture occurred dominantly by intergranular fracture.

Original languageEnglish
Title of host publicationTMS 2011 - 140th Annual Meeting and Exhibition, Supplemental Proceedings
Number of pages5
Publication statusPublished - 2011
EventTMS 2011 - 140th Annual Meeting and Exhibition - San Diego, CA, United States
Duration: 2011 Feb 272011 Mar 3

Publication series

NameTMS Annual Meeting


OtherTMS 2011 - 140th Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Diego, CA


  • Biomedical cobalt-chromium-molybdenum alloy
  • Deformation mode
  • Strain induced hcp transformation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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