Alloy systems are discussed in terms of the theory of interface kinetics which was developed in a previous paper (Jackson and Chalmers 1956). The non-equilibrium equations which are developed reduce to the thermodynamic expressions if the system is in equilibrium. Several types of phase diagrams are discussed. It is shown that a phase diagram gives a reasonably good estimate of the concentrations at an interface if the system is not in equilibrium.
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Kenneth A. Jackson (1958) studied this question.