Stress-strain curve of pure aluminum in a super large strain range with strain rate and temperature dependency

Abstract

Abstract Recently, a high pressure torsion testing method was developed to measure stress - strain curves in a super large strain range, e.g. over 10. In this paper, through improvement of the method to measure strain rate and temperature dependencies, SS curves of pure aluminum were successfully measured in a temperature range of 298 - 573 K (25 - 300 oC) and a strain rate range of 0.02 - 2.0 /s. Strain rate dependency was observed at a lower strain rate of a higher temperature (0.02 /s, 473 K (200 oC) ). Then, distinguished strain rate dependency was shown at 573 K (300 oC). Work softening behavior, which was caused by dynamic recrystallization, was also observed over a strain of 4 (400 %)