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Kinetics of isothermal creep in metallic glasses including the statistical distribution of activation parameters

  • Defects. Dislocations. Physics of Strength
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Abstract

A generalized theoretical model is proposed for the structural relaxation of metallic glasses under load. Structural relaxation is treated as a set of irreversible, uncorrelated, two-stage atomic displacements in some regions of the structure, the “relaxation centers.” In loaded samples structural relaxation acquires a directional character, leading to the buildup of plastic deformation in accordance with the magnitude and orientation of the applied mechanical stress. General equations are obtained for creep kinetics including a continuous statistical distribution of the principal activation parameters. These equations are compared with the results of a special experiment. The model is found to provide an adequate interpretation of the observed creep kinetics, except for the first 101–102 seconds after loading. It is argued that the initial stage of creep is determined by reversible atomic realignments in relaxation centers having symmetric two-well potential.

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Authors and Affiliations

  1. Voronezh State Technical University, 394026, Voronezh, Russia

    A. T. Kosilov

  2. Voronezh State Pedagogical University, 394043, Voronezh, Russia

    V. A. Mikhailov, V. V. Sviridov & V. A. Khonik

Authors
  1. A. T. Kosilov
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  2. V. A. Mikhailov
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  3. V. V. Sviridov
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  4. V. A. Khonik
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Fiz. Tverd. Tela (St. Petersburg) 39, 2008–2015 (November 1997)

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Kosilov, A.T., Mikhailov, V.A., Sviridov, V.V. et al. Kinetics of isothermal creep in metallic glasses including the statistical distribution of activation parameters. Phys. Solid State 39, 1796–1802 (1997). https://doi.org/10.1134/1.1130176

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  • DOI: https://doi.org/10.1134/1.1130176

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