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 proceedingChapterpeer-review


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 (fee) and Co-27%Cr-5%Mo alloy consisting of e phase (hep) were summarized in this study. Stacking fault formation followed by evolution to e 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 yCo-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 e phase, which is due to the highly-accumulated strain at the interface. While, in e 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 publicationSupplemental Proceedings
Subtitle of host publicationGeneral Paper Selections
PublisherJohn Wiley and Sons Inc.
Number of pages5
ISBN (Electronic)9781118062173
ISBN (Print)9781118029473
Publication statusPublished - 2011 May 3


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


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