Abstract: A 7055 aluminum alloy sheet containing 0.1%Ce was prepared in the laboratory, and different solid solution treatments (solution temperature of 465, 470, 475, and 480 ℃, holding time of 20, 40, and 60 min) and aging treatments (aging temperature of 120 ℃, holding time of 0-36 h) were carried out, and the microstructure and mechanical properties were observed and tested by using metallographic microscope, scanning electron microscope, transmission electron microscope, and electronic universal testing machine. The results indicate that there is a low melting point second phase at 470.83 ℃ in the cold-rolled alloy sheet. To avoid burning and reduce the mechanical properties of the sheet, the selection of the solid solution temperature should not exceed this temperature. The optimal solid solution and aging process for the alloy is 470 ℃×60 min+120 ℃×22 h. Under this process, the tensile strength is 577 MPa, the yield strength is 547 MPa, and the elongation is 9.47%.

Key words: 7055 aluminum alloy, solution treatment, aging treatment, mechanical properties