Abstract
The true stress-strain curve of Al-Mg-Si-Cu-Zn alloy under the condition of temperature from 350 °C to 500 °C and strain rate from 0.01 s−1 to 10 s−1 was obtained by Gleeble-3500 thermal-mechanical simulator. Based on these data, the constitutive equation of aluminum alloy is established by using hyperbolic sinusoidal model, and the average hot deformation activation energy Q = 256 kJ/mol is obtained. The model established can well predict the flow behavior of Al-0.9Mg-0.7Si-0.3Cu-0.6Zn alloy, and the average absolute relative error (AARE) between the predicted value and the experimental value is 6.3 %. The processing map was developed according to dynamic material science model (DMM) and Prasad’s criterion and the optimum hot working window is found to be 470 °C -500 °C/0.1 s−1-0.01 s−1. The microstructure evolution of aluminum alloy during isothermal compression deformation was analyzed by transmission electron microscopy (TEM). It was found that DRV is the main dynamic softening mechanism under experimental deformation conditions.
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