Dynamic and Static Softening Behaviors of Al-6%Mg Alloy during two-stage Hot Compression Deformation

The dynamic and static softening behaviors of Al-6%Mg alloy were studied using interrupted two-stage hot compression test. The tests were performed in the temperature isothermally at 480 oCand strain rates of 0.1 and 0.001s- 1. The interrupted deformations were conducted with delay time varying between 29 to 90 s after achieving a strain of approximately 0.5 in the first stage. The results showed that static softening, at constant strain rate, dose not noticeablyoccur with increase of delay time between the deformation stages. Also it was exhibited that softening rate highly enhanced with decrease of strain rate at constant delay time. Moreover, in delay time, static and meta-dynamic recrystallization was considered as the dominant mechanisms at low and high strain rates respectively

Keywords:

dynamic softening , static softening , multi-stage hot compression deformation