Intrinsic diffusivities and the Kirkendall effect were investigated in Fe-Pd solid solutions at 1100C (table 183). Couple techniques were used, including incremental and multi-foil types. A theoretical analysis of the Kirkendall effect was performed for a binary solid solution system. It was demonstrated that, depending upon the relative mobilities of the components in different parts of the interaction zone of binary diffusion couples, the appearance of 2 or more Kirkendall planes was to be expected. This phenomenon was not observed in experiments on single-phase Fe-Pd systems.

M.J.H.Van Dal, M.C.L.P.Pleumeekers, A.A.Kodentsov, F.J.J.Van Loo: Acta Materialia, 2000, 48[2], 385-96

Table 184

Chemical Diffusivity in Disordered (A1) FePt

D (m2/s) = 4.17 x 10-4 exp[-3.08(eV)/kT]