Dislocation kinematics: A molecular dynamics study in Cu

E. Oren, E. Yahel, G. Makov

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageAmerican English
Article number025002
JournalModelling and Simulation in Materials Science and Engineering
Volume25
Issue number2
DOIs
StatePublished - 1 Mar 2017

Keywords

  • dislocations
  • mobility
  • molecular dynamics

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • General Materials Science
  • Computer Science Applications
  • Modelling and Simulation

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