Microstructure and mechanical properties of Co-29Cr-6Mo alloy aged at 1023 K

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Mechanical properties of Co-29Cr-6Mo alloys consisting of ε phase and σ phase were examined at room temperature. Solution treatment at 1523 K for 7.2 ks was carried out for cast Co-29Cr-6Mo alloy, followed by various aging treatments at 1023 K for up to 21.6 ks. The area fraction of the a phase in the aged alloys increases with the aging time at 1023 K and reaches 0.6% after aging at 1023K for 21.6ks. However, mechanical properties such as 0.2% proof strength, ultimate tensile strength and plastic elongation of the aged alloys do not depend on the aging time. It is found that the σ phase less than 0.6% does not cause the deterioration of mechanical properties of the aged Co-29Cr-6Mo alloy.

Original languageEnglish
Pages (from-to)1517-1522
Number of pages6
JournalMaterials Transactions
Issue number6
Publication statusPublished - 2007 Jun


  • Aging treatment
  • Biomaterial
  • Cobalt-chromium-molybdenum alloy
  • Mechanical property
  • Sigma phase (σ)


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