Hot Deformation Characteristics of 2024 Aluminum Alloy

In this paper, the isothermal thermal compression simulation test of 2024 aluminum alloy was carried out. The deformation temperature is 573-723 K, the strain rate is 0.01-10 s(-1), and the deformation amount is 50%. The experimental results show that the change of flow stress is inversely proportional to the deformation temperature, but directly proportional to the strain rate. OM and TEM were used to observe the microstructure after thermal deformation, the increase of temperature and the decrease of strain rate contribute to the formation of recrystallization and the decrease of dislocation density, which is the main reason for dynamic softening. The thermal deformation activation energy of 2024 aluminum alloy is 201.62 kJ/mol. The experimental peak stress constitutive model is in good agreement with the calculated value. Based on the Prasad instability model and the dynamic material model, the hot working diagram of 2024 aluminum alloy is established to construct the true strain of 50%. The ideal deformation conditions are the deformation temperature of 573-673 K and strain rate of 0.01-0.1 s(-1).