Recrystallization, Texture and Mechanical Properties of 7075 Aluminum Alloy During Hot Rolling-Solution and Subsequent Aging

7075 aluminum alloy is an ultra-high-strength aluminum alloy with a wide range of applications in the aerospace and transportation fields. In this paper, we achieved the recrystallization structure refinement of 7075 aluminum alloy sheet by hot rolling-solution process and analyzed the rolling organization and the properties after solution aging. The results show that the deformation is not uniform when rolling at 425°C, and the banded MgZn₂ phase organization is formed in the rolled sheet, while when the temperature is increased to 500°C, the plastic deformability is enhanced and solid solution of MgZn₂ phase occurs. The shear deformation of the grains is one of the main causes of grain distortion and also provides favorable conditions for subsequent rolling-solid solution recrystallization. After three passes of rolling deformation at 425°C/65%, 500°C/38% and 500°C/65%, and then solid solution at 520°C for 1 h, the alloy can achieve complete recrystallization, with most of the grain sizes < 100 µm. Complete recrystallization can significantly weaken the weave structure and improve the degree of uniformity of microstructure. When the alloy is processed by 500°C/65% rolling treatment, 520°C/1 h solution aging treatment, its average ultimate tensile stress reaches 550 MPa, the average elongation reaches 12%, the fracture mode is toughness fracture, and the fracture shows a tough fossa morphology.