Samples of 4N5-purity Fe, with a grain size of 0.25mm was implanted with 40keV 27Al+ ions to a fluence of 9 x 1016/cm2. The 15at%Al specimens were then annealed in dry Ar, and the diffusion coefficients were calculated by monitoring changes in the Al distribution profiles at 775 to 900C. The data were found to obey:

D (cm2/s) = 1.6 x 100 exp[-3.17(eV)/kT]

J.Hirvonen, J.Räisänen: Journal of Applied Physics, 1982, 53[4], 3314-6