Flow Stress Feature of 7075 Al Alloy during Hot Compression Deformation

The flow stress feature of 7075 aluminum alloy during high temperature plastic deformation ranging from 300~500℃ and strain rates of 0.01~1s-1 was studied by the thermal compression using Gleeble-1500 hot-simulator. The results show that both strain rates and deformation temperatures control the flow stress. The flow stress decreases with the increase of temperature, while increases with the increase of strain rates. A hyperbolic sine relationship is found to correlate well the flow stress with the strain rate, and an Arrhenius relationship with the temperature. The flow stress of 7075 aluminum alloy during high temperature deformation can be represented by a Zener-Hollomon parameter.