The hot deformation behaviors of Al-Mg-Si alloys were studied at temperatures of 400–550 °C and strain rates of 0.001–1 s⁻¹. The microstructure of the compressed samples was characterized by electron back scattered diffraction (EBSD). It was found that the strain distribution was inhomogeneous in the hot compress samples, which caused inhomogeneous dynamic recrystallization fraction (X_DRX) at different position of the sample. The geometrically necessary dislocation (GND) density was calculated from EBSD results by a MATLAB toolbox MTEX. GND densities increased with the increase of strain rate and strain, and the decrease of temperature. A constitutive equation was obtained from experimental stress-strain curves. The parameters for a dynamic recrystallization (DRX) kinetic model were determined considering the inhomogeneous X_DRX at different position of the sample. The experimentally acquired constitutive relation and DRX model were imported to commercial software DEFORM-3D to simulate the hot compression tests, and the results agreed well with experimental observations. Finally, the industrial hot extrusion were simulated to further validate the DRX model.

在 400-550 °C 的温度和 0.001-1 s ^{-1 的}应变速率下研究了 Al-Mg-Si 合金的热变形行为。压缩样品的微观结构通过电子背散射衍射（EBSD）表征。发现热压试样的应变分布不均匀，导致动态再结晶分数不均匀（X _DRX) 在样品的不同位置。几何必要位错 (GND) 密度是通过 MATLAB 工具箱 MTEX​​ 从 EBSD 结果计算的。GND密度随着应变速率和应变的增加以及温度的降低而增加。本构方程是从实验应力-应变曲线中获得的。考虑到样品不同位置的不均匀 X _DRX，确定了动态再结晶 (DRX) 动力学模型的参数。将实验获得的本构关系和DRX模型导入商业软件DEFORM-3D进行热压缩试验模拟，结果与实验观察结果吻合较好。最后，对工业热挤压进行了模拟，以进一步验证 DRX 模型。