Titanium alloy has excellent properties such as low density and high strength, so it is an ideal aerospace structural material. At present, the application of titanium alloy in the aerospace industry is more and more popular.In the 1950s, only a few non-load-bearing members, such as rear fuselage insulation panels, air ducts, and tailgates, were made of titanium alloys in aviation aircraft. Since the 1960s, the middle fuselage has been separated. Important bearing members such as frames, beams and flaps are also gradually replaced by titanium alloys.

     As far as the current trend is concerned, the more advanced structural aircraft, the more wide-body aircraft, the greater the amount of titanium used.The density of C-5 titanium alloys that began service in the United States in 1970 was 6%, and the subsequent C-17 increased to 10.3%. After 2006, the amount of titanium used in the fourth generation of US fighter F22 was as high as 39%-41%. China has also made progress in the research and application of titanium alloys.