J. Japan Inst. Metals, Vol. 40, No. 1 (1976),
pp. 26-32

The Effect of Oxygen Potential on the Surface Self-Diffusivity of α -Fe

Kazuyoshi Nii¹ and Kazuhiro Yoshihara¹

Abstract:

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:

(Received 1975/03/19)

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