Flow stress characteristics of isothermal deformation at high temperature for 7075 aluminum alloy

Flow stress of 7075 aluminum alloy in the temperature range of 250 - 450℃C and strain rate range of 1.0 -0.001 s~(-1) was studied by isothermal compression test with Gleeble-1500 machine. The results show that flow stress is controlled by strain rate and deformation temperature, the flow stress increases with strain rate increase, but decreases with temperature raise, and the flow stress of 7075 aluminum alloy during high-temperature deformation can be described by Zener-Hollomon parameter. Stress index n, stress scale parameter α, structural factor A, and activation enthalpy Q of the alloy during plastic deformation at high temperature were derived from the correlativity of flow stress, strain rate, and temperature.