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

作者：Wang, K-K; Hsu, C-W; Chang, L.^*; Cheng, W. J.

来源：Surface and Coatings Technology, 2020, 396: 125969.

DOI：10.1016/j.surfcoat.2020.125969

• Hot-dip galvanizing
• Zn-5 wt.% Al coating
• Fe-Al intermetallic layer
• Fe4Al13-xZnx
• Orientation relationship
• Interface

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.

• 单位
  中山大学