Fe/Zn拡散対に形成される化合物層の組織変化(<特集>合金化溶融亜鉛めっき皮膜の構造と特性)

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The microstructural evolution of intermetallic compound layers formed in Fe/Zn diffusion couples (DCs) was examined by optical and scanning electron microscopies and electron-probe microanalysis. In the solid-Fe/liquid-Zn DCs at 450℃, the δ_p phase nucleates between the δ_k and ζ phases after dipping for about 100 s and every intermediate phase seems to obey the square root law individually before and after the appearance of the δ_p phase at 100s. In the concentration-penetration profiles, a composition gap is observed in the δ_p phase of the solid-Fe/liquid-Zn DCs dipped for a long time at temperatures ranging from 450 to 550℃, while only a singular point, but no gap, is obtained in the DCs dipped at elevated temperatures over 575℃. On the other hand, in the case of the solid-Fe/solid-Zn DCs at 400℃, the δ_k phase instead of the δ_p phase appeares later between the δ_p and Γ phases and finally covers the whole δ region.
2005-03-01