The Influence of Transient Strain Rate Deformation on the Microstructure of AA2024 Aluminum Alloy in the Low Temperature Range

摘要

Constant and varying strain rate deformation conditions have been applied to AA2024 aluminum alloy using hot compression testing in the temperature range of 200-300℃. The initial strain rate was 0.1 s~(-1) and the second pass strain rate of 0.0001, 0.001 and 0.01 s~(-1) have also been tested. Our results shows that in low temperature range with decreasing strain rate in the second pass straining hardening rate is increased. Increasing the strain rate along with deformation causes to the both restoration processes and dynamic coarsening. Decreasing strain rate during the second pass straining increase the mobile dislocation density.