Kazuyoshi Nii1 and Kazuhiro Yoshihara1
1National Research Institute for Metals, Tokyo
The surface self-diffusivity of α -Fe was measured by the grain boundary grooving method in hydrogen atomospheres with dew points of -60 and +13°C. The groove width measurement was made through all runs with the same region of grain boundary of a coarse-grained specimen. The diffusion anneal was carried out at 800, 850 and 890°C.
In dry hydrogen (dew point -60°C) purified through a palladium foil, the surface self-diffusivity of α -Fe can be expressed by the following equation:
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