STP1365: A Dispersion Strengthened Co-Cr-Mo Alloy for Medical Implants

    Wang, KK
    Assistant Director, Principal Research Scientist, Director, Research and Development, Howmedica Inc., Pfizer Medical Technology Group, Rutherford, NJ

    Berlin, RM
    Assistant Director, Principal Research Scientist, Director, Research and Development, Howmedica Inc., Pfizer Medical Technology Group, Rutherford, NJ

    Gustavson, LJ
    Assistant Director, Principal Research Scientist, Director, Research and Development, Howmedica Inc., Pfizer Medical Technology Group, Rutherford, NJ

    Pages: 9    Published: Jan 1999


    Abstract

    A dispersion strengthened version of forged Co-Cr-Mo alloy, GADS Vitallium® alloy, was developed to improve fatigue strength after sintering (1300°C), a required thermal cycle treatment for porous coated products. GADS alloy was made using a powder metallurgy process to create fine dispersed oxides in the alloy. The dispersed fine particles strengthen the alloy and prevent grain growth so that the alloy retains fatigue strength almost twice that of the standard forged alloy (ASTM F-799, Standard Specification for Cobalt-28 Chromium-6 Molybdenum Alloy Forgings for Surgical Implants) following porous coating sintering. The processing development, grain structures, fatigue properties, and corrosion resistance of the gas-atomized dispersion strengthened (GADS) alloy are reported here.

    Keywords:

    Co-Cr-Mo alloys, dispersion strengthened, fatigue strength, porous coating, surgical implants


    Paper ID: STP14265S

    Committee/Subcommittee: F04.93

    DOI: 10.1520/STP14265S


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