Abstract
A model developed to describe the kinetics of surface segregation in binary alloys is extended to include higher order multicomponent alloys. The generalized differential equations are given and then solved for the specific case of a ternary alloy using a regular solution expansion for the chemical potential terms. It is shown that the equilibrium values are consistent with predictions from thermodynamical equilibrium considerations. The characteristic interaction between the two diffusing species in a ternary alloy causes surface segregation phenomena such as cosegregation which is discussed in terms of a non-zero interaction coefficient. The system of differential equations is solved for several sets of segregation parameters to show the wide scope and applicability of this model.
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