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Molecular Statics Simulations of the Motion of a Single Kink in NiAl

Published online by Cambridge University Press:  01 January 1992

T.A. Parthasarathy
Affiliation:
UES, Dayton, OH-45432
D.M. Dimtduk
Affiliation:
Wright Laboratory, WL/MLLM, WPAFB, OH-45433
G. Saada
Affiliation:
LEM-CNRS, ONERA , France
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Abstract

Atomistic simulations of dislocation motion in intermetallics have so far been limited to straight dislocations. In this work, this limitation is relaxed by developing a technique to construct and study dislocation kinks. Using the EAM method, the intermetallic compound, NiAl, is studied using OK simulations of single kinks on a mixed dislocation in the <001>{110} slip system. The threshold stress for the motion of the kink is calculated as 0.00125-0.00185μ, (∼160 Ħ230 MPa), which is fairly close to the CRSS measured at 77 K. These results, suggest that kink motion may be a contributory factor to the slip response of NiAl at low temperatures.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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