Hot Deformation Behavior of 2195 Al-Li Alloy Under Plane Strain Compression

2195 Al-Li alloy was identified as an ideal construction material for aerospace field, but researches on its hot deformation behavior were quiet rare. In this study, isothermal compression tests were conducted at Gleeble-3500 thermal mechanical simulator in the temperature range from 400 degrees C to 500 degrees C and strain rate range from 0.01 s(-1) to 10 s(-1). Results show that flow stress reaches its minimum under the condition of high temperature and low strain rate. Furthermore, constitutive equation was established to describe the flow stress and the hot deformation activation energy of 2195 Al-Li alloy is 214.937 kJ/mol. By analyzing the processing map, the optimum processing parameters are obtained, i.e. temperature between 475 degrees C to 500 degrees C, strain rate close to 0.01 s(-1). It is quite convenient to estimate DRX behavior through a judgment equation of dynamic recrystallization.