Nitrogen-induced dynamic strain aging in a biomedical-grade Co-Cr-Mo alloy

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Abstract

The present study examined plastic deformation behavior of a biomedical-grade Co-29Cr-6Mo (wt.%) alloy at intermediate temperatures, focusing on dynamic strain aging (DSA) induced by nitrogen doping (0.2wt.%). The compression tests were performed at strain rates in the range of 10 -4 to 10 -1s -1 at temperatures between room temperature and 1073K. Gliding of Shockley partial dislocations bounding stacking faults played a dominant role in the plastic deformation over a wide temperature range. The nitrogen-associated DSA resulted in enhanced in-grain lattice distortions even when there was little macroscopic serrated flow. Shear band formation was identified after the lamellar structures developed, in spite of quite small macroscopic strain (5% in height reduction). Cr-N short-range ordering can be responsible for the observed DSA.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalMaterials Science and Engineering A
Volume552
DOIs
Publication statusPublished - 2012 Aug 30

Keywords

  • Biomedical-grade Co-Cr-Mo alloys
  • Dislocation structure
  • Dynamic strain aging
  • Nitrogen addition

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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