Alloy Design and Application Expectation of A New Generation 600℃ High Temperature Titanium Alloy

The developments of advanced aeroengine and ultrasonic aircraft have impending demands for 600℃ high temperature titanium alloy which is heat-resistant and has a relatively low density. By substituting steel or superalloys,600℃ high temperature titanium alloy can be manufactured into high pressure compressor discs,blades,blisks and casing of aeroengines,structural components and airframe skins of aircraft. As a result,the weight of aeroengine and aircraft can be reduced,thus the thrust-weight ratio of aeroengine,flight speed and flexibility of aircraft can be improved markedly. The design of 600℃ high temperature titanium alloy is restricted by the intrinsic contradiction between creep and thermal stability. To maximize the creep resistance,meanwhile keeping a combination of good fracture toughness,ductility and thermal stability,a new generation 600℃ titanium alloy TA29 of Ti-Al-Sn-Zr-Nb-Ta-Si-C system was designed and developed based on the Equivalent Design Criterion( EDC) and Diffusion Theory to meet the rigid design demand.TA29 alloy may seek a wide scope of application,such as high temperature components in advanced aeroengines and ultrasonic aircraft.The creep-fatigue-environment interaction,micro-textured region,surface integrality,residual stress and service properties of TA29 alloy and its components may be the research emphases in the future.