Morphology and formation of Fe-Al intermetallic layers on iron hot-dipped in Al-Mg-Si alloy melt

作者：Takata Naoki^*; Nishimoto Manamu; Kobayashi Satoru; Takeyama Masao

来源：Intermetallics, 2014, 54: 136-142.

DOI：10.1016/j.intermet.2014.06.003

• Intermetallics
• Diffusion
• Coatings
• Microstructure

We have examined the morphology and the growth of Fe-Al intermetallic layers of eta-Fe2Al5 and theta-FeAl3 phases formed on pure Fe sheets dipped in an Al-8.2Mg-4.8Si (wt.%) alloy melt and pure Al melt at 750 degrees C. The eta phase layer grows one order of magnitude slower in the Al-Mg-Si alloy melt than in the pure Al melt. The change in thickness of Fe sheets with dipping time is less pronounced in the Al-Mg-Si alloy melt than in a pure Al melt. Microstructure observations suggest that the retarded interfacial reaction between solid Fe and liquid Al-Mg-Si alloy is associated with a continuous theta phase layer formed in the Al-Mg-Si alloy melt, which acts as the diffusion barrier.

• 出版日期2014-11