Abstract
Fast solute diffusion in certain dilute binary alloys can be understood by a modified version of Hägg's rule. This method is substantiated and used to analyse published data on fast diffusion of (mainly) 3d-solutes in the anisotropic host phases β-U and α-Zr and to compare the results with those in bcc host phases. The activation enthalpy Q of fast diffusion consists of elastic contributions, ΔHel and Δhel, related to the Hägg parameter λ and a chemical one, ΔHcov, due to the electronic solute-solvent interaction. For Fe, Co, Ni and O in α-Zr, ΔHcov can be inferred from relevant solute–host phase diagrams. The Hägg-approach defines the geometrical frame within which fast solute diffusion occurs. To a certain degree it is complementary to the Miedema model which, however, is bound to neglect the structural details of the host lattice essential for interstitial diffusion.
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