The Al self-diffusion coefficient in the B2-type intermetallic compound, Fe-48at%Al, was determined by using the intrinsic diffusion coefficients of Fe and Al, the self-diffusion coefficient of Fe and the Darken-Manning relationship. The self-diffusion coefficient of Al was estimated to be a factor of about 0.6 smaller than that of Fe, and the activation energy for Al self-diffusion was deduced to be 280kJ/mol. This was a little higher than the value (262kJ/mol) for Fe self-diffusion, thus indicating that the diffusion mechanisms for both components were almost the same.

Self-Diffusion of Aluminium in the Intermetallic Compound Fe-48at%Al. R.Nakamura, Y.Iijima: Philosophical Magazine, 2003, 83[4], 477-83