Abstract

Abstract Self-diffusion measurements have been made in the temperature range 1000°c to 1550°c in order to resolve some uncertainties arising from previously published data from several separate investigations covering various parts of this range. A normal Arrhenius type of temperature dependence has been found, indicating the operation of a single diffusion mechanism with constant values of frequency factor and activation energy. Self-diffusion in chromium does not therefore exhibit the property of non-linear dependence of log D on 1/T recently established in other b.c.c. transition metals, Ti and Zr. The present results are in good agreement with those of Hagel for the temperature range 1200°c to 1600°c, and it is suggested that a predominance of grain boundary diffusion at lower temperatures is largely responsible for deviations of the results of other investigations from those of Hagel and the present authors.