Interdiffusion in Fe/Pt Bulk Diffusion Couples

摘要

Interdiffusion in Fe/Pt multi-phase diffusion couples has been investigated in the range from 1173 to 1473 K. Interdiffusion coefficients, D were determined by the Boltzmann-Matano analysis. At 1473 K, The values of interdiffusion coefficients in Pt3Fe and FePt phases coincide well with those determined from single-phase diffusion couples. The extrapolated value of the interdiffusion coefficients at N_(Fe) = 0 coincides with the impurity diffusion coefficient of Fe in Pt at 1473 K. However, the extrapolated values of interdiffusion coefficients at N_(Fe) = 1 is much smaller than the impurity diffusion coefficient of Pt in Fe. On the other hand, the interdiffusion coefficients obtained in both PtaFe and FePt at lower temperatures are much larger than those determined by single-phase diffusion couples. It is supposed that the interface reaction or short circuit diffusion such grain boundary diffusion in multi-phase diffusion couple predominated.