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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,
Diana Farkas and
Zhao-Yang Xie
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.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994, 293
Copyright
Copyright © Materials Research Society 1994

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