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    STP1020

    Strain-Induced Hydrides and Hydrogen-Assisted Crack Growth in a Ti-6Al-4V Alloy

    Published: 01 January 1989


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    Abstract

    The formation of strain-induced hydrides and the interaction of hydrides with crack growth in a Ti-6Al-4V alloy containing 790-ppm hydrogen have been studied by transmission electron microscopy (TEM) of thin-foil specimens stretched in situ. Three types of strain-induced hydrides were found: a crack tip hydride and two plate-like hydrides. The hydrides have either a face-centered tetragonal (fct) or a face-centered cubic (fcc) structure and are metastable. The formation and subsequent rupture of the hydrides at and in front of the crack tip were observed during crack growth. Hydrogen-assisted crack growth in Ti-6Al-4V alloys is discussed in terms of a hydride mechanism for cracking.

    Keywords:

    strain-induced hydrides of titanium, hydrogen assisted crack growth, in situ, TEM study, the hydride mechanism for cracking, Ti-6Al-4V alloy


    Author Information:

    Gao, S-J
    Associate professor, graduate student, and professor, Institute of Metal Research, Academia Sinica, Shenyang,

    Xiao, H-Z
    Associate professor, graduate student, and professor, Institute of Metal Research, Academia Sinica, Shenyang,

    Wan, X-J
    Associate professor, graduate student, and professor, Institute of Metal Research, Academia Sinica, Shenyang,


    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP18844S