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Atomistic Simulation of Dislocation Motion as Determined by Core Structure

Published online by Cambridge University Press:  15 February 2011

Kevin Ternes
Affiliation:
Department of Materials Science and Engineering Virginia Polytechnic Institute and State University, Blacksburg VA 24061
Diana Farkas
Affiliation:
Department of Materials Science and Engineering Virginia Polytechnic Institute and State University, Blacksburg VA 24061
Zhao-Yang Xie
Affiliation:
Department of Materials Science and Engineering Virginia Polytechnic Institute and State University, Blacksburg VA 24061
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Abstract

Two different interatomic potentials of the embedded atom type were used to study the relationships between dislocation core structure and mobility. Core structures were computed for a variety of dislocations in B2 NiAl. Several non-planar cores were studied as they reacted to applied stress and moved. The results show that in some cases, the dislocation core transforms to a planar structure before the dislocation glides, whereas in some other cases the core retains the non-planar structure at stresses sufficient to sustain glide. The effects of stoichiometry deviations on the core structure and motion were also studied.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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