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We examine the interdiffusion in multicomponent systems using the approachanalogically to one developed earlier for description of interdiffusion inbinary alloys. This approach in opposite to traditional theory, takes intoconsideration an active role of vacancies, equilibrium distribution of which isnot supposed. In this case, in equations for flux components there arecontributions conditioned by vacancy concentration gradient. As the vacancydiffusion coefficient is much larger than those for the components, acounteraction to this process will equalize the fluxes of components and,consequently, hinder from increase of deviation of vacancy concentration fromthe equilibrium one. If we substitute the expressions for fluxes in theequation of a continuity then we have the system of diffusion equations forcomponents and vacancies. This system is solved and we have found a relationbetween the interdiffusion coefficients and the corresponding tracer diffusioncoefficients. Interdiffusion coefficient equations sufficiently differ fromtraditional one (Darken's approach). The analysis of the possible reasons ofsluggish diffusion in multicomponent alloys is carried out on the basis of thederived equations for fluxes.

Alternative interdiffusion theory of many component alloys