Investigation on the Grain Structure Evolution and Abnormal Stress Increase of Al–Mg–Si Alloy During Hot Deformation

l–Mg–Si alloys are widely used in many fields due to their excellent comprehensive performance, but medium strength. In order to study the hot deformation behavior and microstructural evolution of Al–Mg–Si alloys, the isothermal compression tests were carried out on the Gleeble-3500 thermal/mechanical simulation machine. The varying temperatures between 623 and 773 K and strain rates of 0.001 s −1 to 1 s −1 with true strain of 0.51, 0.92 and 1.2 were considered. Strain-compensated Arrhenius model with modified friction was constructed and the correlation coefficient ( R ), absolute relative error ( AARE ) between the experimental and predicted values reached to 0.998 and 1.95