Abstract
The kinetics of impurity segregation to surfaces and grain boundaries are investigated within a phenomenological theory. The process is determined by volume diffusion. The nature of the boundary conditions is taken into account in the framework of regular solution. Coupled integral equations describing the time evolution of segregation in multicomponent systems are derived. Computer simulations were carried out for systems showing site competition and repulsive interaction between both segregants. It is found that characteristic nonequilibrium levels like segregation maxima occur. The influence of cooling rate is discussed with respect to stabilization of nonequilibrium segregation.
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