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Atomistic simulation of the pinning of edge dislocations in Ni by Ni3Al precipitates

✍ Scribed by Christopher Kohler; Peter Kizler; Siegfried Schmauder

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 236 KB
Volume: 400-401
Category: Article
ISSN: 0921-5093
DOI: 10.1016/j.msea.2005.01.072

No coin nor oath required. For personal study only.

✦ Synopsis

Classical molecular dynamics simulations of the interaction of edge dislocations in Ni with chains of spherical Ni 3 Al precipitates are performed using EAM potentials. The order hardening is investigated at temperature T = 0 K by determining the critical resolved shear stresses (CRSSs) for a superdislocation that is dissociated into four partial dislocations. The CRSS is computed as a function of the radius and the distance of the precipitates. It is found that for precipitates with a diameter smaller than the dissociation width of perfect edge dislocation in Ni, the CRSS of the trailing dislocation of the superdislocation is a fraction of about 0.4 of the CRSS of the leading dislocation.

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