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 language | American English |
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Article number | 025002 |
Journal | Modelling and Simulation in Materials Science and Engineering |
Volume | 25 |
Issue number | 2 |
DOIs | |
State | Published - 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