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Temperature-Dependent Structure of a<101> Superdislocations in Ni3Al

Published online by Cambridge University Press:  22 February 2011

D. C. Chrzan ,
S. M. Foiles ,
M. S. Daw  and
M. J. Mills
D. C. Chrzan
Affiliation:
Computational Materials Science Department, Sandia National Laboratories, Livermore, CA
S. M. Foiles
Affiliation:
Computational Materials Science Department, Sandia National Laboratories, Livermore, CA
M. S. Daw
Affiliation:
Department of Physics, Clemson University, Clemson, SC
M. J. Mills
Affiliation:
Department of Materials Science, Ohio State University, Columbus, OH.
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Abstract

The dissociated structure of the a〈101〉 superdislocations in Ni3Al is predicted as a function of temperature. The temperature dependence of the relevant fault Helmholtz free energies and elastic constants are calculated within the quasiharmonic approximation using the embedded atom method. The results of these calculations are then incorporated into anisotropic elasticity theory-based calculations of the dissociation distances. The cross-slip activation enthalpy is estimated and found to decrease by 24% at 600 K when compared with its 0 K value. The calculations point to the need to perform experiments to address this temperature dependence.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 731
Copyright
Copyright © Materials Research Society 1995

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