STP780: Effect of Ion Implantation on Fretting Fatigue in Ti-6Al-4V Alloy

    Vardiman, RG
    Metallurgist and head, Physical Metallurgy Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.,

    Creighton, D
    Professor and graduate students, University of Missouri-Columbia, Columbia, Mo.

    Salivar, G
    Professor and graduate students, University of Missouri-Columbia, Columbia, Mo.

    senior materials engineer, Pratt & Whitney, West Palm Beach, Fla.

    Effatian, A
    Professor and graduate students, University of Missouri-Columbia, Columbia, Mo.

    project engineer, G and H Technology, Inc., Santa Monica, Calif.

    Rath, BB
    Metallurgist and head, Physical Metallurgy Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.,

    Pages: 12    Published: Jan 1982


    Abstract

    The effect of fretting on the fatigue life of titanium alloys is known to be severely deleterious. A preliminary study shows ion implantation to hold great promise for improving the fretting fatigue life in Ti-6Al-4V alloy.

    Carbon implanted at 75 keV to a dose of 2 × 1017 atoms/cm2 gives a peak concentration of 30 atomic percent at a depth of approximately 1700 Å. Incoherent particles of titanium carbide averaging 100 Å in size were found by transmission electron microscopy. Fatigue specimens were subjected to fretting on one surface at a normal stress of 20.7 MPa. A significant improvement in lifetime was found. No difference in the mode of failure was observed between the implanted and the unimplanted specimens.

    Keywords:

    materials fatigue, fretting, ion implantation, titanium alloys, electron microscopy


    Paper ID: STP29401S

    Committee/Subcommittee: G02.30

    DOI: 10.1520/STP29401S


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