SUPER LIGHT ALLOY Al-Cu-Li - FATIGUE CRACK GROWTH RESISTANCE AT TEMPERATURES 293 AND 77 K

摘要

The aim of this study was to investigate fatigue crack growth resistance of a new superlight high-strength Al-Cu-Li alloy at 293 and 77K and to assess the possibility of its application in cryogenic aerospace structures. It is found that at temperatures lowering to 77K fatigue crack growth resistance is essentially dependent on the sample orientation with respect to the sheet rolling direction and on the amplitude of the stress intensity factor. The correlation of the kinetic fatigue failure diagrams, fracture macromorphology and the specific structure-phase alloy state has been analyzed.