Abstract
A determination of the variation of interdiffusion coefficient with composition for Nb-V alloys has been made for diffusion temperatures of 1404°, 1505°, 1630° and 1750°C. Three types of doubly infinite couples were employed: Nb/V, Nb/alloy and V/alloy, where the alloy was 50 at.% Nb. Compositions in the diffusion zone were determined by electron-beam microanalyzer. Kirkendall shifts were measured in all couples. It was found that the shift in the Nb/alloy couple was greater than the theoretical maximum shift calculated by assuming that the intrinsic diffusion coefficient of Nb is zero. This effect is believed to be due to a current of non-equilibrium vacancies in the diffusion zone, giving rise to a chemical potential gradient due to vacancies.
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