Diffusion in Binary Alloys

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Abstract
Darken has given a phenomenological theory of diffusion in binary alloys based on the assumption that each constituent diffuses independently relative to a fixed reference frame. It is shown that diffusion via vacant lattice sites leads to Darken's equations if it is assumed that the concentration of vacant sites is in thermal equilibrium. Grain boundaries and dislocations may act as sources and sinks for vacant sites and act to maintain equilibrium. The modifications required in the equations if the vacant sites are not in equilibrium are discussed.

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