Static recrystallization model and microstructure evolution of high strength Al-Zn-Mg-Cu alloy
The hot deformation behaviors of Al-Zn-Mg-Cu alloy for aviation were investigated using Gleeble 3800 thermal simulator.The microstructure after deformation was characterized.The static softening behaviors were analyzed systematically.The static recrystallization dynamic model was established.The results show that the activation energy of static recrystallization of the experimental Al-Zn-Mg-Cu al-loy is 129162 J·mol-1.The volume fraction of static recrystallization is affected by deformation temperature,deformation degree and de-formation rate,and the deformation temperature has the most obvious effect on static recrystallization.When the deformation rate is con-stant,the higher the deformation temperature is,the less the influence of pass residence time is.After low temperature deformation at 350 ℃,there are still a large amount of dislocation entanglement inside the α-Al matrix grains.After medium temperature deformation at 400 ℃,the dislocation movement can be fully carried out,and some grains undergo recrystallization.After high temperature deformation at 450 ℃,the matrix grains are basically recrystallized,and Al-Zn-Mg-Cu quaternary phase particles with the size range of 5-25 nm are found inside the matrix grains.For different thermal deformation conditions,the error of the model prediction value is in the range of 0.008-0.0625,and the calculation accuracy of the dynamical model is high.
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