The enhancement factors for solute diffusion in dilute body-centered cubic alloys were approached in 2 ways. One was based upon a Taylor’s series expansion of the activation energy and pre-exponential factor as a function of concentration. The convergence of this series was studied. The other method was formulated in terms of statistical theory. A comparative analysis of these 2 approaches was carried out in order to explain the enhancement of diffusion. As an example, the concentration dependence of the jump frequency was investigated for dilute V-Zr solid solutions. It was shown that the dependence was related to a change in the migration energy, and to changes in the vibration frequency.

D.Fuks, V.Segel, J.Pelleg: Journal of Materials Science, 1995, 30[5], 1283-9