Abstract
In this paper, a comprehensive diffusion kinetics theory is formulated to describeseamlessly tracer and chemical diffusion in antistructurally disordered B2intermetallics showing positive and negative deviations from stoichiometry. Thetheory is based around unit processes consisting of six-jump cycles that can beassisted by intrinsic and extrinsic antistructural atoms of either atomic species.The Ising alloy model is used to illustrate the formalism, but the formalism can beadapted to other models. Expressions are developed for the tracer diffusioncoefficients, the phenomenological coefficients, the intrinsic diffusion coefficients,the interdiffusion coefficient and the various correlation factor components.Results for the tracer and collective correlation factors and the vacancy windfactor (in interdiffusion) are in excellent agreement with results fromMonte Carlo computer simulations based around single vacancy jumps.
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