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Emission of partial dislocations by grain boundaries in nanocrystalline metals

  • Defects, Dislocations, and Physics of Strength
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Abstract

A theoretical model is proposed to describe the emission of partial dislocations by grain boundaries in nanocrystalline materials during plastic deformation. Partial dislocations are assumed to be emitted during the motion of grain-boundary disclinations, which are carriers of rotational plastic deformation. The ranges of the parameters of a defect structure in which the emission of partial dislocations by grain boundaries in nanocrystalline metals are energetically favorable are calculated. It is shown that, as the size of a grain decreases, the emission of partial dislocations by its boundary becomes more favorable as compared to the emission of perfect lattice dislocations.

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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

    M. Yu. Gutkin, I. A. Ovid’ko & N. V. Skiba

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  1. M. Yu. Gutkin
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  2. I. A. Ovid’ko
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  3. N. V. Skiba
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__________

Translated from Fizika Tverdogo Tela, Vol. 46, No. 11, 2004, pp. 1975–1985.

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

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Gutkin, M.Y., Ovid’ko, I.A. & Skiba, N.V. Emission of partial dislocations by grain boundaries in nanocrystalline metals. Phys. Solid State 46, 2042–2052 (2004). https://doi.org/10.1134/1.1825547

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  • DOI: https://doi.org/10.1134/1.1825547

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