Self-diffusion and diffusion of cobalt in alpha and delta iron

Abstract
Measurements by Borg, Birchenall and Lai are at variance with the results recently reported by James and Leak. Our measurements of the self-diffusion of iron in body-centred cubic iron define a deviation from the Arrhenius relationship commencing at approximately 900°C. With an alloy the measurements of Borg et al. extend from 700 to 1500°C, and with this extended range it has been shown, in a previous paper, that the deviation is commensurate with the change in the elastic properties of the material, according to the theories of Zener and LeClaire.