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Calculation and Simulation of Interdiffusion Coefficients and Ordering Kinetics in Binary Alloys.

Published online by Cambridge University Press:  26 February 2011

M. Atzmon
M. Atzmon*
Affiliation:
Department of Nuclear Engineering, The University of Michigan, Ann Arbor, MI 48109
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Abstract

Rate equations for thermally activated atomic exchange were used to calculate chemical diffusion coefficients for an initially disordered simple-cubic lattice and for a body-centered lattice with equilibrium long-range order. The results show that the chemical enhancement as a function of the enthalpy of mixing saturates, in contrast with results of conventional mean-field theories. Simulations in a disordered alloy agree with the calculations. The existence of longrange order is shown to increase the apparent activation energy for diffusion. The present theory is also shown to provide a simple method of calculating ordering kinetics and equilibrium longrange order, and good agreement with previous experiments and simulations is achieved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 363
Copyright
Copyright © Materials Research Society 1992

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