By D. J. Fisher
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During annealing, the quasi-vacancies were removed and the diffusivity tended to a constant value which depended only upon the temperature. Mehrer: Physical Review B, 1991, 44, 101-14  Co89Zr11: Co Diffusion Measurements were made of tracer diffusivity in amorphous samples which had been prepared by melt-spinning in vacuum. The diffusivity in as-quenched material was enhanced by the presence of quasi-vacancies (excess free volume). During annealing, the quasi-vacancies were removed and the diffusivity tended to a constant value which depended only upon the temperature.
352 61  Cu: Au Grain Boundary Diffusion Grain boundary diffusion was determined for 195Au migrating via various boundaries. A series of 12 symmetrical  tilt boundaries was used. 9° S = 5 (310) coincidence site lattice boundary; with a spread of 6°. 78, the orientation dependence of the diffusion product exhibited a characteristic cusp at an orientation which was slightly below the ideal S = 5 coincidence site lattice grain boundary orientation. The activation enthalpy for grain boundary diffusion exhibited a marked orientation dependence at lower temperatures.
Four samples, with various grain sizes, were prepared by melting, adding Ti and B, casting, re-melting and solidifying unidirectionally. The grain-refined samples contained small particles within the matrix. The H diffusivity obeyed Arrhenius-type behavior at 573 to 873K. 9(kcal/mol)/RT] respectively. The diffusivity was not affected by the small particles in the matrix, and depended only upon the grain size. A so-called grain-boundary cross effect, which referred to fast diffusion along grain boundaries and suppressed diffusion due to H trapping at nodes or grain boundary junctions, was confirmed.
A Directory of Arrhenius Parameters: Metals by D. J. Fisher