STP1450

    Mechanism-Based Variability in Fatigue Life of Ti-6Al-2Sn-4Zr-6Mo

    Published: Jan 2004


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    Abstract

    The variability in fatigue life of a Ti-6Al-2Sn-4Zr-6Mo alloy was studied. The cumulative life distribution plot was found to be composed of two distinct failure mechanisms, designated as Type-I and Type-II. The likelihood of Type-I vs. Type-II failure shifted with respect to the stress level, such that at lower stress levels, there was increased probability of Type-II failure. It also was found that the variability in life was introduced primarily at the crack nucleation stage, specifically, formation of a stage-I crack across an equiaxed primary-α particle.

    Keywords:

    microstructure, fatigue life variability, crack nucleation, crack growth, probability of failure, deformation, slip transfer


    Author Information:

    Jha, SK
    Systran Federal Corporation, Dayton, OH

    Larsen, JM
    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLMN, Wright Patterson AFB, Dayton, OH

    Rosenberger, AH
    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLMN, Wright Patterson AFB, Dayton, OH

    Hartman, GA
    The University of Dayton Research Institute, Dayton, OH


    Paper ID: STP11283S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP11283S


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