Stability of Metallic Glasses: Criteria and Prediction of Ductile-Brittle Transition and Crystallization

    Volume 9, Issue 2 (February 2012)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 21 December 2011

    Page Count: 17


    Zaichenko, S. G.
    I.P. Bardin Central Research Institute for Ferrous Metallurgy,

    Glezer, A. M.
    I.P. Bardin Central Research Institute for Ferrous Metallurgy,

    Filippova, V. P.
    I.P. Bardin Central Research Institute for Ferrous Metallurgy,

    (Received 30 April 2011; accepted 14 November 2011)

    Abstract

    A close correlation between the mechanical behavior changes of metal-metalloid glasses and their relaxation spectrum heat emissions has been found. The criteria of crystallization and ductile-brittle transition for these kinds of metallic glasses (MGs) have been established. They correspond to the heat emission balance between the low- and high-temperature parts of the relaxation spectrum. The model of MGs as a system constituting an additive sum of elementary two-level transitions with continuously distributed activation energies is proposed for the analytical description of the relaxation spectrum and its parameters. The methods developed in the approximation of the model permit the determination of the current state of MG materials at an arbitrary temperature, as well as forecasting of their ductile-brittle transition and crystallization according to heat emission alterations of the relaxation spectrum.


    Paper ID: JAI103936

    DOI: 10.1520/JAI103936

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    Author
    Title Stability of Metallic Glasses: Criteria and Prediction of Ductile-Brittle Transition and Crystallization
    Symposium , 0000-00-00
    Committee C14