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From Solid State Diffusion to Configurational Kinetics

Published online by Cambridge University Press:  10 February 2011

G. Martin ,
M. Athènes ,
C. Desgranges ,
M. Nastar  and
F. Soisson
G. Martin
Affiliation:
CEA-Saclay, CEREM, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, France; [email protected]
M. Athènes
Affiliation:
CEA-Saclay, CEREM, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, France
C. Desgranges
Affiliation:
CEA-Saclay, CEREM, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, France
M. Nastar
Affiliation:
CEA-Saclay, CEREM, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, France
F. Soisson
Affiliation:
CEA-Saclay, CEREM, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, France
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Abstract

A single model is proposed to describe the cohesive energy and the vacancy jump frequencies as a function of the alloy configuration at the atomic level. The very same model therefore yields both equilibrium and kinetic properties, close and far away from equilibrium. The model is handled at two levels of approximation: Monte Carlo techniques and mean-field type approximations. The model yields equilibrium properties (including the transport coefficients and complex diffusion mechanisms in ordered compounds close to equilibrium) as well as the kinetic path for phase separation, with or without ordering. This allows to identify specific effects of the vacancy diffusion mechanism on the kinetic path for alloy decomposition. Here, we summarise the main results of the above approach.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 527: Symposium Z – Diffusion Mechanisms in Crystalline Materials , 1998 , 35
Copyright
Copyright © Materials Research Society 1998

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References

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