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Chain decay of low-angle tilt boundaries in nanocrystalline materials

  • Defects, Dislocations, and Physics of Strength
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Abstract

In terms of two-dimensional dislocation-disclination dynamics, a theoretical model is developed to describe the decay of a low-angle tilt boundary in a deformed nanocrystalline material under the action of an externally applied elastic stress and of the elastic field of a neighboring decayed boundary. The critical external stresses are calculated at which the boundary decays and the dislocations making up this boundary either are trapped by the boundary that decayed earlier or break away from both boundaries. The decay of a low-angle tilt boundary is shown to result in a substantial decrease in the critical decay stresses for the neighboring boundaries, which can cause an avalanche-like chain decay of low-angle boundaries yielding high-density ensembles of mobile dislocations capable of carrying substantial plastic deformations and of forming shear bands in deformed nanocrystalline materials.

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Authors and Affiliations

  1. Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Vasil’evskii Ostrov, Bol’shoi pr. 61, St. Petersburg, 199178, Russia

    S. V. Bobylev, M. Yu. Gutkin & I. A. Ovid’ko

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  1. S. V. Bobylev
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  2. M. Yu. Gutkin
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  3. I. A. Ovid’ko
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__________

Translated from Fizika Tverdogo Tela, Vol. 46, No. 11, 2004, pp. 1986–1990.

Original Russian Text Copyright © 2004 by Bobylev, Gutkin, Ovid’ko.

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Bobylev, S.V., Gutkin, M.Y. & Ovid’ko, I.A. Chain decay of low-angle tilt boundaries in nanocrystalline materials. Phys. Solid State 46, 2053–2057 (2004). https://doi.org/10.1134/1.1825548

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  • DOI: https://doi.org/10.1134/1.1825548

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