Significant improvement in mechanical properties of biomedical Co-Cr-Mo alloys with combination of N addition and Cr-enrichment

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Abstract

An improvement in the mechanical properties of a biomedical Ni-free Co-Cr-Mo alloy under as-cast condition has been examined by means of tensile tests and microstructure observations. The solubility of N in Co-Cr-Mo alloys increases with increasing Cr content from 29 to 34 mass%. This results in a significant improvement in mechanical properties such as yield stress, tensile strength, and fracture elongation. The improvement in the mechanical properties results from the γ phase stabilization and inhibition of the σ phase formation due to N addition. Increasing the Cr content also has contributed to the improved mechanical properties.

Original languageEnglish
Pages (from-to)260-264
Number of pages5
JournalMaterials Transactions
Volume49
Issue number2
DOIs
Publication statusPublished - 2008 Feb

Keywords

  • Biomaterial
  • Casting
  • Cobalt chromium molybdenum alloy
  • Nitrogen

ASJC Scopus subject areas

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

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