Behavior of Flow Stress of Al-Mn Alloy during Hot Compression

The behavior of flow stress of Al-Mn alloy during hot compression at the condition of e=0.05,0.5,5,25s-1 while the temperature range from 300°C to 450°C was studied by Gleblee-3500. The results show that the Al-Mn alloy possess the remarkable characteristic of a peak stress, followed by a steady-state flow stress when deformed in the temperature range from 300°C to 450°C with a strain rates range from 0.05s-1 to 0.5s-1.When the strain rate is higher than 5s-1 dynamic recrystallization will happen. The true stress decrease with increasing compression temperature and increases with the increasing strain rate. A constitution equation which can describe the relationship of e,T and σ is achieved. Also the activation energy for deformation is calculated.