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First Principles Calculation of Phase Stability of High Temperature Intermetallic Alloys

Published online by Cambridge University Press:  26 February 2011

J. Mikalopas ,
P.A. Sterne ,
M. Sluiter  and
P.E.A. Turchi
J. Mikalopas
Affiliation:
Lawrence Livermore National Laboratory, L-268, Livermore, CA 94550
P.A. Sterne
Affiliation:
Lawrence Livermore National Laboratory, L-268, Livermore, CA 94550
M. Sluiter
Affiliation:
Lawrence Livermore National Laboratory, L-268, Livermore, CA 94550
P.E.A. Turchi
Affiliation:
Lawrence Livermore National Laboratory, L-268, Livermore, CA 94550
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Abstract

One way to calculate the coherent phase diagram of an alloy based on first principles methods is to compute the ground state total energy for various ordered configurations, from which many-body interactions can be calculated and employed in a thermodynamic model. If the Connolly and Williams method (CWM) is used to extract the many-body interactions from the calculated total energies, the resulting many-body interactions can exhibit a strong dependence on the choice of ordered configurations and multi-site clusters, and the accuracy and convergence of the CWM energy expansion is not assured. To overcome this difficulty, a successful systematic method for implementing the CWM is proposed. This approach is applied to a study of the fcc-based Ni-V and Pd-V substitutional alloys and these interaction parameters together with the cluster variation method (CVM) are used to calculate phase diagrams.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 119
Copyright
Copyright © Materials Research Society 1991

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References

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