Dislocation kinematics: a molecular dynamics study in Cu

The kinematics and kinetics of edge and screw dislocations in FCC materials were studied by molecular dynamics, with Cu as a case study. It was found that with increasing stress screw dislocations enter into the transonic regime continuously and that they remain stable up to a velocity of about 2.2...

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Bibliographic Details
Published in:Modelling and simulation in materials science and engineering 2017-03, Vol.25 (2), p.25002
Main Authors: Oren, E, Yahel, E, Makov, G
Format: Article
Language:English
Subjects:
dislocations
mobility
molecular dynamics
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Summary:The kinematics and kinetics of edge and screw dislocations in FCC materials were studied by molecular dynamics, with Cu as a case study. It was found that with increasing stress screw dislocations enter into the transonic regime continuously and that they remain stable up to a velocity of about 2.2 km s−1. Edge dislocations are limited by the transverse sound velocity at low stresses and discontinuously cross into the transonic regime at higher stresses. For sufficiently long edge dislocations, the subsonic-transonic transition is initiated by an athermal nucleation process. Finally, an expression for the velocity dependence of the dislocation mobility was derived.
ISSN:0965-0393
1361-651X
DOI:10.1088/1361-651X/aa52a7