A study has been made of the role of microstructure in room-temperature tensile properties as well as elevated-temperature creep behavior of an advanced Ti3Al-base alloy, Ti-25Al-10Nb-3V-1Mo (atomic percent). Creep studies have been performed on this alloy as a function of stress and temperature between 650C and 870C. A pronounced influence of microstructure on creep resistance was found. Generally, the beta solution-treated colony-type (slow-cooled or SC) microstructure showed superior creep resistance. Study of the stress dependence of steady-state creep rate indicates that increasing temperature caused a gradual decrease in the stress exponent n and a transition in creep mechanism at 870C, depending on applied stress level. Transmission electron microscopy (TEM) observations of deformed dislocation structures developed during steady-state creep and room-temperature tensile tests, as well as the corresponding fracture modes, were used to interpret properties as a function of temperature. Finally, creep behavior of the present Ti3Al alloy was found to be superior to that of conventional near-alpha titanium alloys.


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    Title :

    Creep behavior of Ti-25Al-10Nb-3V-1Mo


    Additional title:

    Kriechverhalten von Ti-25Al-10Nb-3V-1Mo


    Contributors:
    Cho, W. (author) / Thompson, A.W. (author) / Williams, J.C. (author)


    Publication date :

    1990


    Size :

    11 Seiten, 18 Bilder, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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