A series of mechanical properties tests, such as tensile tests, impact tests, fracture toughness tests, and fatigue tests, at room temperature to 4K were mainly conducted on Ti-5Al-2.5Sn ELI and Alloy 718 for liquid hydrogen engine of a launch vehicle. The obtained tensile and fracture toughness properties were a little bit smaller than those reported by NASA and NRIM before, however, the fatigue properties were relatively lower than the data reported so far. Data resulting from the tests were reviewed in detail and published in the form of data sheets. The result shows and effect of microctructure of those mateirals on their mechanical properties at cryogenic tempeatures and the data sheet program on space use materials are introduced.
