INFLUENCE OF AGING ON LOW CYCLE FATIGUE BEHAVIOR IN 8090 Al-Li ALLOY
(1.State Key Laboratory of Fatigue and Fracture for Materials Institute of Metal Research Academia Sinica Shenyang 110015
2.Shenyang Industrial University Shenyang 110023)
2.Shenyang Industrial University Shenyang 110023)
Abstract: Low cycle fatigue(LCF) tests under different total strain amplitudes have been conducted in four aging conditions of 8090 Al-Li alloy. It was found that the cyclic stress response and the LCF lifetime of the alloy varied with the aging conditions and strain amplitudes. The cyclic stress-strain behaviour and fracture mode of Al-Li alloy are closely related to an increasing in the dislocation density, dislocation-dislocation interactions and interactions between the precipitates with dislocations.
Key words: low cycle fatigue cyclic hardening precipilate phase