Titanium is used in foreign aviation jet engines

The aerospace industry is the main use of titanium, and jet engines are an important part of the main use of titanium. According to the statistics of the United States, from 1959 to 1973, the United States jet engine manufacturing industry used titanium accounted for 37% to 50% of the total consumption of the country, and the amount of titanium used in small subsonic jet engines accounted for 1/3 of its total mass. In aero-engine, the medium-temperature component made of titanium material has higher fatigue strength, yield degree, creep strength and lower elastic modulus than steel material, so it can reduce the stress under fatigue load. 

Titanium alloys have high corrosion resistance and can greatly reduce the compression performance of jet engines. By increasing the pressurization ratio of engine compressor and the gas temperature of turbine inlet, the total efficiency of engine can be improved, thus increasing engine thrust, improving thrust-to-weight ratio and reducing fuel consumption. The total pressure ratio of engine compressors in the United States and Britain increased from 10-13 in the early 1960s to 20-27 in the 1970s, and is rising year by year, and the total pressure is expected to increase to 50. Without cooling technology, the temperature of turbine inlet of multi-role fighter has already exceeded 1650℃.

The titanium used in jet engines produced by Pratt & Whitney in the United States is 7%-15% of the total mass, while the titanium used in GE J73 jet engine is 6%. The rotor of J79 engine used to be made of stainless steel grade 17, and then changed to grade 11 titanium alloy. The titanium used in J79-8 engine is 20%. The J79-3 engine uses 4% titanium.

In Russia, the HK8 turbofan engine for the Il-62 transport uses about 40% of its mass titanium alloy, as does the HK144 turbofan engine for the Tu-144 supersonic transport.

The high-pressure compressor drum of Rolls-Royce RB172 engine is made of titanium alloy IMI685 (Ti-6Al-5Zr-0.5Mo-0.25Si), which has high creep resistance, fracture toughness and excellent weldability.