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Real Space Multiple Scattering Description of Alloy Phase Stability

Published online by Cambridge University Press:  25 February 2011

P. E. A. Turchi and
M. Sluiter
P. E. A. Turchi
Affiliation:
Lawrence Livermore National Laboratory, Condensed Matter Division (L-268), Livermore, CA 94550
M. Sluiter
Affiliation:
Lawrence Livermore National Laboratory, Condensed Matter Division (L-268), Livermore, CA 94550
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Abstract

We present a brief overview of the advanced methodology which has been recently developed to study phase stability properties of substitutional alloys, including order-disorder phenomena and structural transformations. The approach is based on the real space version of the Generalized Perturbation Method, first introduced by Ducastelle and Gautier, within the Korringa-Kohn- Rostoker multiple scattering formulation of the Coherent Potential Approximation. Temperature effects are taken into account with a generalized meanfield approach, namely the Cluster Variation Method. The viability and the predictive power of such a scheme will be illustrated by a few examples, among them: (1) the ground state properties of alloys, in particular the ordering tendencies for a series of equiatomic bcc-based alloys, (2) the computation of alloy phase diagrams with the case of fcc and bcc-based Ni-Al alloys, (3) the calculation of antiphase boundary energies and interfacial energies, and (4) the stability of artificial ordered superlattices.

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