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The influence of many body interactions in the stress-velocity relation of a single dislocation in a 2D lattice

Published online by Cambridge University Press:  17 March 2011

M. Robles ,
V. Mustonen ,
K. Kaski  and
M. Patriarca
M. Robles
Affiliation:
Helsinki University of Technology, Laboratory of Computational Engineering P.O.Box 9400, FIN-02015 HUT, FINLAND
V. Mustonen
Affiliation:
Centro de Investigacón en Energía UNAM, Priv. Xochicalco S/N, Col. Centro, Temixco, Mor.; A.P. 34, C.P. 62580 México
K. Kaski
Affiliation:
Centro de Investigacón en Energía UNAM, Priv. Xochicalco S/N, Col. Centro, Temixco, Mor.; A.P. 34, C.P. 62580 México
M. Patriarca
Affiliation:
Centro de Investigacón en Energía UNAM, Priv. Xochicalco S/N, Col. Centro, Temixco, Mor.; A.P. 34, C.P. 62580 México
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Abstract

The stress-velocity relation of a single dislocation moving in a 2-D lattice has been studied using interactive molecular dynamic simulations. A hybrid interatomic model potential which couples Lennard-Jones(LJ) potential and the Embedded Atom Model (EAM) potential, is used to include radial and many body interactions. Both parts are assembled by a parameter so that the potential can be changed to describe a pure radial interaction to a strong many body interaction in a continuous way. Setting up a constant-stress scenario, the movement of a single dislocation is tracked from zero velocity state, up to a terminal velocity state. The external stress vs. terminal velocity curves have been obtained in the subsonic regime for different values of the coupling parameter. Non-linear relations are found velocity regime 0.1ct to 0.6ct, where Ct is the transverse speed of sound. Results have been analyzed using an augmented Peierls model to seek the connection between atomic scale, continuum variables and the limiting speed of dislocations

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 696: Symposium N – Current Issues in Heteroepitaxial Growth--Stress Relaxation and Self Assembly , 2001 , T4.10
Copyright
Copyright © Materials Research Society 2002

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