Abstract
An expression for the variation with composition of the diffusivity of the solute atoms in interstitial solid solutions is derived. The diffusion model is based on the application of the absolute reaction rate theory to a solution whose mixing statistics are described by first order pairwise interactions. The theoretical expression is compared with experimental data for carbon in austenite and excellent agreement is found using a solute-solute binding energy identical to that found from the equilibrium thermodynamics of the system.
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