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Computer Simulation of ao<110> Screw Dislocations in Ni3Al

Published online by Cambridge University Press:  26 February 2011

T.A. Parthasarathy
Affiliation:
Universal Energy Systems Inc.,Dayton,OH, 45432.
D.M. Dimiduk
Affiliation:
Wright Research and Development Center,WRDC/MLLM,WPAFB,OH, 45433–6533.
C. Woodward
Affiliation:
Universal Energy Systems Inc.,Dayton,OH, 45432.
D. Diller
Affiliation:
Wright Research and Development Center,WRDC/MLLM,WPAFB,OH, 45433–6533.
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Abstract

Dissociation of the ao<110> screw dislocation in Ni3Al was studied using the embedded atom method of computer simulation. The dissociation occurred predominantly along the {111} plane, however, a {001}-plane step occurred in the APB at the center of the configuration. When a pair of ao/2<110> superpartials initially separated in the {111} plane was relaxed, the step formed once again but with a reduced height. When the pair was relaxed from larger distances the step was not formed. The results indicate that the elastic interaction “torque” due to elastic anisotropy is responsible for the formation of the {001} APB step. When a stress was applied to these dislocation configurations by simulation, results confirmed that the step in the APB and the octahedral cross-slipped-core dissociations can be significant barriers to glide of the screw dislocation.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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