Thermal deformation behavior for 7039 aluminum alloy at elevated temperature

The flow stress features of 7039 aluminum alloy were studied by isothermal compression of cylindrical specimen at 300-500 ℃ and strain rate of 0.01-10 /s with Gleeble-1500 simulated machine. The results show that the flow stress is controlled by strain rate and deformation temperature. The flow stress increases with strain rate increasing and decreases with deformation temperature increasing. The 7039 aluminum alloy shows the phenomenal of dynamic recovery at the strain rates less than 10 /s; the alloy shows the phenomenal of partial dynamic recrystallization at the strain rates higher than 10 /s. The flow stress of 7039 aluminum alloy during high temperature deformation can be represented by Zener-Hollomon parameter. Four material constants of the alloy during plastic deformation at high temperature are derived from the interdependencies of flow stress, strain rate and temperature.