Kinetic equation theory of atom transport in a random alloy in a superposition approximation

摘要

The matter transport coefficients defined by nonequilibrium thermodynamics are calculated for the vacancy migration mechanism in a random alloy of arbitrary vacancy content. The perturbations to the atomhyphen;vacancy pair correlation functions are calculated when steady matter fluxes are created by a uniform external field. The Kirkwood superposition approximation for triplet distribution functions is used to truncate the hierarchy of kinetic equations for correlation functions in the steady state. The procedure leads very simply to several results obtained earlier by diverse methods and generalizes some of them to arbitrary vacancy content.