Microstructure, Processing and Properties of A New Two‐Phase Titanium Alloy

Abstract

In many applications alloys with higher strength than Ti-6Al-4V ELI and a similar level of fracture toughness and similar fatigue crack growth behavior are desirable. To achieve an excellent combination of high strength and good fracture toughness, a new two-phase titanium alloy based on Ti-Al-Mo-Cr-Sn-X was developed. The precipitation of 2 phase after various heattreatment was investigated, and its influence on the strength and toughness was discussed. Basketweave and equiaxed microstructures were respectively obtained after and / processing, and the mechanical properties of the two kinds of microstructures were compared. The basketweave microstructure of the designed alloy exhibits a remarkable combination of tensile strength and fracture toughness and fatigue crack growth rate similar to Ti-6Al-4V ELI. The designed alloy with good damage tolerance is an attractive material for aviation structural application.