THE EFFECT OF HOT DEFORMATION ON THE MECHANICAL PROPERTIES AND STRUCTURE OF THE Al–Zn–Mg–Cu ALLOY SYSTEM

Aluminum alloys pass a number of stages of thermal and deformation effects. Each previous stage affects the next one. For each specific aluminum deformable alloy, it is important to carry out pressure treatment in the best temperature range for it, providing the highest degree of deformation. Thermomechanical processing modes should contribute to the formation of a material structure that improves the mechanical properties of the product. The purpose of the work is to determine the effect of the hot deformation temperature on the mechanical properties and structure of the alloy of the Al–Zn–Mg–Cu system. The mechanical properties under static tension of an aluminum alloy of the Al–Zn–Mg–Cu system at 20, 370, 400, and 430◦C have been experimentally studied. The greatest elongation (about 112%) during stretching occurs at a temperature of 400◦C due to dynamic recrystallization and dynamic polygonization of the alloy. After stretching at 430◦C, there are areas with deformation bands in the fracture of the sample, which indicates the development of grain boundary slippage of the initial grains during deformation of the alloy.