Variables affecting growth and morphology of the intermetallic layer (Fe_2Al_5)

摘要

A steel substrate containing 0.4% carbon was hot-dip aluminized in pure Al and Al-11 wt.% Cu alloy. During the aluminizing process, an intermetallic layer (Fe_2Al_5) was developed at the interface between the aluminizing metal and the steel substrate. The effects on its growth and morphology resulted due to variation in compositions of aluminizing metal, carbon content of the steel substrate, aluminizing temperatures (675-950 °C) and dipping times (1-10 min) were investigated. In pure Al, the intermetallic layer was thick and it showed a finger-like growth with the substrate.