Abstract
Abstract Bulk and grain boundary (GB) diffusion of Nb in α-Fe were studied in the temperature interval from about 700 to 1100 K by the radiotracer method combined with serial sectioning. A non-Arrhenius temperature dependence of Nb bulk diffusion was established below the Curie temperature T c. This observation was discussed in relation to the well-known magnetically-induced diffusion anomaly in α-Fe and to the contribution of dislocation diffusion. In contrast, a practically linear Arrhenius temperature dependence was found for Nb GB diffusion. At Tc, bulk and GB diffusion of Nb are about one order of magnitude faster than the corresponding self-diffusivities of α-Fe. The effect of matrix purity on Nb GB diffusion in α-Fe was studied.
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