Characterization of the FeAl intermetallic layer formed at Fe-Zn interface of a hot-dip galvanized coating containing 5 wt.% Al

摘要

The characterization of the Fe-Al intermetallic layer formed at the Fe-Zn interface of a Zn-5 wt% Al coating is presented in this paper. The interfacial layer was solely composed of Fe4Al13-xZnx crystals, but it exhibited different morphologies. The layer formed on alpha-Fe grains, having orientations of < 100 > //ND or < 110 > // ND, was smooth with a uniform thickness of 50-100 nm. The composing crystals were columnar in shape with their (010) plane parallel to a common {011}(alpha )plane. Five possible orientation relationships between alpha-Fe and Fe4Al13-xZnx were proposed, and three of them were verified. The layer formed on the < 111 > //ND grains was rough with thicknesses varying from 30 to 200 nm. The Fe4Al13-xZnx crystals in the rough region formed flower-like aggregates, in which five Fe4Al13-xZnx variants co-existed.

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