Abstract

Experimental results on short-range and long-range hydrogen diffusion are presented for nanocrystalline Fe90Zr10, produced by crystallization of melt-spun amorphous ribbons, and compared with those for amorphous alloys. Both the amorphous and nanocrystalline alloys show a strong concentration dependence on the hydrogen diffusion kinetics, which can be explained by a potential with a distribution of site, as well as saddlepoint enthalpies, according to the Kirchheim model. In the nanocrystalline alloys these topologically disordered regions are assigned to the interfaces. The average activation enthalpy of hydrogen diffusion in the interfaces is about 0.1eV lower than in amorphous Fe91Zr9, indicating lower potential barriers in the interfaces of the nanocrystalline material than in the amorphous state.

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