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Issues > Archive of Issues > 2007-2 > pp.271-282

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M. Yu. Gutkin and I. A. Ovid’ko, "Dislocation loop nucleation and plastic deformation of nanocrystalline materials," Mech. Solids. 42 (2), 271-282 (2007)
Year 2007 Volume 42 Number 2 Pages 271-282
Title Dislocation loop nucleation and plastic deformation of nanocrystalline materials
Author(s) M. Yu. Gutkin (Institute for Problems in Engineering Sciences, Russian Academy of Sciences, Bol’shoy pr-t 61, St. Petersburg, 199178, Russia, gutkin@def.ipme.ru)
I. A. Ovid’ko (Institute for Problems in Engineering Sciences, Russian Academy of Sciences, Bol’shoy pr-t 61, St. Petersburg, 199178, Russia, ovidko@def.ipme.ru)
Abstract We propose a three-dimensional model of plastic deformation of a mechanically loaded nanocrystalline material by means of heterogeneous nucleation of loops of complete and partial lattice dislocations and by means of grain boundary dislocations on the already formed dislocation loops. We calculate and compare the energy variations characterizing various versions of dislocation loop nucleation. We discover three basic regions of variation of nanocrystalline material grain dimensions which are characterized by their own types of loop nucleation. We also study the role played by loop nucleation in plastic and superplastic deformations of nanocrystalline materials.
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Received 07 September 2004
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