Interdiffusion coefficients in ß and ß' alloys at 1000C were deduced from concentration profiles in solid-solution diffusion couples. The coefficient went through a relative maximum near to the order/disorder transition composition. Intrinsic diffusion coefficients for Al and Fe were also determined at marker compositions of 17 and 29at%Al. Although the values of the intrinsic diffusion coefficients were significantly higher at 29 than at 17at%Al, the Al/Fe intrinsic diffusivity ratio was 1.4 to 1.5. The intrinsic coefficients were related to the atomic mobilities, vacancy-wind terms and thermodynamic factor.

Interdiffusion, Intrinsic Diffusion and Vacancy-Wind Effect in Fe-Al Alloys at 1000C. Y.H.Sohn, M.A.Dayananda: Scripta Materialia, 1998, 40[1], 79-84