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    High-Temperature Mechanical Properties of Tantalum

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    Recrystallization, tensile, and creep-rupture behavior of high-purity tantalum and two interstitial-containing tantalum alloys have been determined. After a 75 per cent cold reduction, tantalum was completely recrystallized on annealing 1 hr at 1200 C; this temperature was increased slightly by adding 560 ppm oxygen. Tensile properties up to 500 C were determined. It was shown that the influence of interstitials in causing discontinuous yielding could be correlated with diffusivities. The moderate (25,000 to 32,000 psi) tensile strength of unalloyed tantalum can be increased by cold working and by minor additions of interstitials. The creep resistance of tantalum is increased by interstitial additions at short times and moderate temperatures, but is relatively unaffected at higher temperatures and longer times. Cold work remains effective in strengthening tantalum up to 750 C.

    Author Information:

    Holden, F. C.
    Battelle Memorial Institute, Columbus, Ohio

    Schwartzberg, F. R.
    The Martin Co., Denver, Colo.

    Jaffee, R. I.
    Battelle Memorial Institute, Columbus, Ohio

    Committee/Subcommittee: B02.10

    DOI: 10.1520/STP46328S