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Mechanism of strain hardening and dislocation-structure formation in metals subjected to severe plastic deformation

  • Defects, Dislocations, and Physics of Strength
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Abstract

The equations of dislocation kinetics are used to theoretically analyze the mechanism of strain hardening and the formation of fragmented dislocation structures in metals at large plastic strains. A quantitative analysis of the available data on aluminum and an aluminum-magnesium alloy shows that strain hardening at large plastic strains and the formation of fragmented dislocation structures are related to the interaction and self-organization of geometrically necessary dislocations (GNDs). On the microscale, the source of the GNDs is a locally nonuniform plastic deformation induced by a dislocation-density gradient in dislocation-cell boundaries.

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Authors and Affiliations

  1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    G. A. Malygin

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  1. G. A. Malygin
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Original Russian Text © G.A. Malygin, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 4, pp. 651–657.

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Malygin, G.A. Mechanism of strain hardening and dislocation-structure formation in metals subjected to severe plastic deformation. Phys. Solid State 48, 693–699 (2006). https://doi.org/10.1134/S1063783406040123

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  • DOI: https://doi.org/10.1134/S1063783406040123

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