Interfacial structure of steel–aluminum bonding plate under non-equilibrium rapid solidification

摘要

A steel–aluminum solid–liquid bonding plate is prepared using a non-equilibrium rapid solidification method (including four kinds of processes such as roughening the steel plate surface, immersing in flux at the steel plate surface, short-time bonding and rapid solidification). The interfacial structure of the bonding plate is investigated by means of electron probe microanalysis and X-ray diffraction. The results show that the interfacial structure of the bonding plate under non-equilibrium rapid solidification is quite different from that of the bonding plate in conventional steel–aluminum solid–liquid bonding, i.e. the interface of the bonding plate under non-equilibrium rapid solidification is made up of an aluminum-rich region (in the form of a group of Fe₄Al₁₃ teeth that grow from the contact surface to the steel side) at the bulge of steel plate surface and an aluminum-poor region (in the form of Fe–Al solid solution of which the Al content is less than 3.5?wt%) at the concave surface of the steel plate alternately.