Abstract
59Fe tracer diffusion is used as a highly structure-sensitive tool for probing the interface structure and residual amorphous intergranular phases in nanocrystalline (n-) Fe 90Zr 10 produced by crystallization of melt-spun amorphous ribbons. Analyses of 59Fe-diffusion profiles show the existence of two types of interfaces. In the one type the diffusivities are low; the other type acts as fast diffusion paths like conventional grain boundaries in α-Fe. In accordance with positron-annihilation and hydrogen-site spectroscopy of the interfacial structure on n-Fe 90Zr 10, the slow diffusion process may indicate the presence of amorphous intergranular layers similar as recently found for n-Fe 73.5Si 13.5B 9Nb 3Cu 1.
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