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Short-range dislocation interactions using molecular dynamics: Annihilation of screw dislocations

Published online by Cambridge University Press:  31 January 2011

S. Swaminarayan ,
R. LeSar ,
P. Lomdahl  and
D. Beazley
S. Swaminarayan
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
R. LeSar
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P. Lomdahl
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. Beazley
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

We present results of a large-scale atomistic study of the annihilation of oppositely signed screw dislocations in an fcc metal using molecular dynamics (MD) and an Embedded-Atom-Method (EAM) potential for Cu. The mechanisms of the annihilation process are studied in detail. From the simulation results, we determined the interaction energy between the dislocations as a function of separation. These results are compared with predictions from linear elasticity to examine the onset of non-linear-elastic interactions. The applicability of heuristic models for annihilation of dislocations in large-scale dislocation dynamics simulations is discussed in the light of these results.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 12 , December 1998 , pp. 3478 - 3484
Copyright
Copyright © Materials Research Society 1998

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