High-temperature tensile properties and fracture characteristics in a monolithic gamma TiAl alloy and a TiB2 particle-reinforced TiAl alloy

摘要

Titanium aluminides possess some excellent physical and mechanical properties for structural applications in aerospace and automobile industries. This is due to their low density, good elevated-temperature strength, high resistance to oxidation, and excellent creep properties [1,2], However, titanium aluminides suffer from low ductility and fracture toughness at ambient temperatures. These appear to be the main drawbacks to their full utilization as engineering materials. Recent research and development efforts on multi-component two-phase titanium aluminides based on y-TiAl have resulted in substantial improvement in their mechanical and metallurgical properties. Several areas in jet-engine applications have been identified for titanium aluminides to replace superalloys.