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

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 influx 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 bondingplate under non–equilibrium rapid solidiication 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 ismade 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.