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Order-Disorder Phenomena in Complex Alloys: The Case of A15-Based Substitutional Alloys

Published online by Cambridge University Press:  28 February 2011

P.E.A. Turchi  and
A. Finel
P.E.A. Turchi
Affiliation:
Lawrence Livermore National Laboratory, L-268, P.O. Box 808, Livermore, CA 94550
A. Finel
Affiliation:
ONERA, BP72, 92322 Chatillon Cedex, France
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Abstract

We first discuss the applicability of the Generalized Perturbation Method to the study of ordering phenomena in complex alloys for which stability properties are electronically driven. In particular, according to previous work, it is recalled that a 3D-generalized Ising model is appropriate to address the problem of configurational order in A 15-based substitutional alloys. A ground state analysis of this model, including 1st, 2nd and weak 3rd and 7th pair interactions, generates two new ordered states at the composition A5B3 and A7B, apart from the well known A3B configuration. The stability of these predicted configurations is examined as a function of temperature and concentration by means of standard statistical techniques. The results are discussed in relation with the experimental situation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 101
Copyright
Copyright © Materials Research Society 1991

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