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Modern aircraft can travel at more than 2.7 times the speed of sound. Flying at supersonic speeds that fast would cause the plane to rub against the air and generate a lot of heat. When the speed of flight reaches 2.2 times the speed of sound, aluminum alloy can not withstand. High temperature resistant titanium alloys must be used.
When the thrust-weight ratio of the aero engine is increased from 4~6 to B8~10, and the compressor outlet temperature is correspondingly increased from 200~300℃ to 500~600 ℃, the original low-pressure compressor disc and blade made of aluminum must be changed to titanium alloy.
In recent years, scientists have made new progress in the study of titanium alloy properties. The original titanium alloy composed of titanium, aluminum and vanadium has a high working temperature of 550~600℃, and the newly developed aluminum titanium (TiAl) alloy has a high working temperature of 1040℃.
Using titanium alloy instead of stainless steel to make high-pressure compressor discs and blades can reduce the weight of the structure. For every 10 percent reduction in weight, the plane saves 4 percent in fuel. For rockets, every 1kg of weight reduction can increase the range of 15km.
It can be seen that the application of titanium alloy processing materials in aviation will be more and more, and major titanium alloy manufacturers should be committed to the development and production of high-end titanium alloys to ensure that they have a place in the titanium alloy market.