China’s New Aircraft Engine Alloy Enables J-20 to Defeat F22Posted: June 24, 2016
China has developed a much better aircraft engine alloy that will enable its J-20 stealth fighter jet to defeat US F22 and dominate the air.
China’s news.ifeng.com posted a report on June 22 on Professor Chen Guang’s success in developing an aircraft engine material much better than US best alloy for aircraft engine. Chen has achieved the success through long-term research with the funding from Nanjing Polytechnic University and the state’s Program 973.
Prof. Chen’s achievement, Polysynthetic twinned TiAl (PST TiAl) single crystals for high-temperature applications, was published on the Internet at Natural Materials on June 20.
When US GE’s new material Ti-48Al-2Cr-2Nb (Alloy 4822) was used in its GEnx engine for Boeing 787, it was hailed as a sensational success in the development of aircraft engine materials as it reduces the weight of an aircraft engine by 200 pounds, fuel consumption by 20% and discharge of NOx by 80% and significantly lowered engine noise.
At room temperature, PST TiAl has high tensile ductility of 6.9%, yield strength of 708 MPa and tensile strength of 978 MPa, a wonderful combination of ductility and strength.
What is more important for aircraft engine alloy, at the high temperature of 900℃ its yield and tensile strength is still as high as 637MPa and it has wonderful creep resistance. Its minimum creep rate and lasting life are better than Alloy 4822 by one to two magnitudes. It is hopeful that the allow may be used above 900℃ much higher that the 650~750℃ for Alloy 4822.
Source: news.ifeng.com “China makes major breakthrough in aircraft engine material with lasting life better than US material by 2 magnitudes” (summary by Chan Kai Yee based on the report in Chinese)