Influence of Thermomechanical Treatment on the Properties of Alloys of the Mg-Al-Zn-Mn System

Magnesium alloys are subjected, after low-pressure casting, to hot-rolling and extrusion. It is shown that their structural states, for different rates of these processes, are determined by the joint development of dynamic recrystallization, formation of twins, and changes in the phase composition. It is demonstrated that the dissolution of metastable phase components and the corresponding decrease in the resistance of particles of the second phase to the displacements of grain boundaries with large disorientation angles in the process of recrystallization represent one of the causes of increase in the sizes of grains in the matrices of alloys. The mechanical properties of alloys are determined not only by the grain sizes and phase composition but also by the structural anisotropy formed as a result of thermomechanical treatment.