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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 beta-U and alpha-Zr and to compare the results with those in bcc host phases. The activation enthalpy Q of fast diffusion consists of elastic contributions, delta H(el) and delta h(el), related to the Hägg parameter lambda and a chemical one, delta H(cov) due to the electronic solute-solvent interaction. For Fe, Co, Ni and O in alpha-Zr, delta H(cov) 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.

Additional information

Authors: BLANK H, JRC Karlsruhe (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials (1996)
Record Number: 199710224 / Last updated on: 1997-04-01
Original language: en
Available languages: en