Abstract: 7000 series aluminum alloys have attracted much attention due to their advantages such as low density, high strength, andhigh toughness. The alloy’s comprehensive performance can be enhanced through double-pass hot deformation in industry. To obtain the properties of aluminum alloy close to the ideal state, it is necessary to grasp the influence of double-pass hot deformation process parameters on the microstructure evolution. In this work, isothermal hot compression of 7050 aluminum alloy was carried out using TA DIL 805D thermomechanical machine. The predefined temperatures were 360 and 400 ℃, the strain rate was 0.05 s-1, the interval time was 10 and 100 s, the first-pass strains were 0.2, 0.4, 0.6, 0.8 and 1.0, and the total strain was 1.1. The effects of deformation temperature, interpass time and first-pass strain on the flow stress, static and dynamic softening mechanisms, second phase and texture of 7050 aluminum alloy were studied. The results show that dynamic and static softening mechanisms occurred in 7050 aluminum alloy during double-pass hot deformation, and both mechanisms were recrystallized. With the increase of deformation temperature, the recrystallization process is accelerated, and a strong P texture is formed, the first-pass strain increases, and the dynamic softening effect will sharply increase, which is beneficial for dynamic recrystallization. The cube and R-cube textures appear, and the strength increases with the increase of the first-pass strain. The increase of the interpass time results in a large amount of texture accumulating on the α-orientation line. In addition, some insoluble phases were found in the alloy after hot compression, but their number and distribution were independent of the deformation conditions.
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