Onsager's phenomenological scheme for diffusion in multicomponent liquid systems is examined for suitability as a description of metallic interdiffusion. Subject to certain restrictions and approximations a set of non-linear differential equations is obtained which can be simply applied to important boundary conditions. A solution of the set for the system iron, carbon, silicon is shown to provide a good fit to Darken's experimental results.
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J. S. Kirkaldy (1957) studied this question.
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