Abstract
The Kirkendall effect was observed for diffusion of aluminum into α-iron. An iron polycrystal block with W-markers was sealed together with Fe3Al powder in an iron-cylinder and was subjected to diffusion anneal. The marker shift was found to proportionate with the square root of annealing period, but no porosity was found near the marker. The chemical diffusion coefficient for aluminum into iron was obtained as a function of aluminum concentration by Matano’s analysis. Diffusion coefficients of iron and aluminum at the position of marker were also calculated by marker velocity vm and the chemical diffusion equation by Darken, and also by the ratio of diffusive quantities of iron and aluminum at the position of marker and Darken’s equation. These two values are in good agreement in order of magnitude.
