Temperature and Stress Dependence of Occurrence of Strain Burst in Cyclic Creep of AI-Mg Alloy

摘要

Cyclic creep tests of Al-Mg alloy have beenconducted at a wide range of stress andtemperature.When Mg content is beyond 0.45%,the strain bursts can be observed in the cyclic creepcurves.There exists a critical stress for the occur-rence of the strain burst,which increases with an in-crease of Mg content and is almost 60% of the ul-timate tensile stress.The occurrence of strain burstis proposed to be controlled by the easiness of thecross-slip of dislocations.For Al-Mg alloy,thedynamic strain aging plays an important role in thestrain bursts.