Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy Matrix Composites

A novel melting infiltration by ultrasonic vibration was investigated and applied to fabricate Ti6Al4V (TC4) lattice structure-reinforced Mg–10Gd–2Y–1Zn– x Zr (refer to VW92 hereafter, x = 0, 0.5 wt%) alloy matrix composites. The edge-to-edge matching model indicates that the well-matching and possible orientation relationships (ORs) between the α -Mg and α -Ti, [10–10] α -Mg //[11–23] α -Ti in (0002) α -Mg //(10–10) α -Ti possesses the smallest misfit of 0.4% ( f r ), and thus the α -Mg grains can nucleate on the TC4 lattice structure. Interfacial reaction occurred in the TC4/VW92 + 0.5 wt% Zr composites, and the reaction product was confirmed to be Al 2 Zr 3 , AlZr 2 and α -Ti (Zr) particles formed by continuous solution of Zr–Ti. Among the interfacial products, the AlZr 2 phase is a brittle phase with high-volume fraction, which is not conducive to the load transfer. But generally speaking, the α -Ti (Zr) and the α -Mg tend to form a coherent interface, which is beneficial for improving the interfacial bonding strength of composites.