轴向闭式辗轧成形对7050 铝合金组织性能的影响

After axial closed die rolling (ACDR) technology forming and simulation, the influence of ACDR on the microstructure and properties of 7050 aluminum alloy was studied. The results show that the strain distribution of 7050 aluminum alloy thick plate after ACDR is as follows: Center>1/2R>edge, and mushroom effect exists in the forming process. By OM and SEM abservation, it is found that there are some differences in the forged structure at different locations. The central position is an equiaxed crystal structure, the dynamic recovery occurs at 1/2R, and the structure at the edge is blurred and shows a fibrous structure. After solution treatment at 472 ℃×150 min and dual aging treatment at 120 ℃×400 min+160 ℃ ×360 min, radial and chord tensile properties of the center and edge are tested at room temperature, respectively. The results show that there are some differences in the yield strength and elongation of 7050 aluminum alloy at the center and edge, and little difference in the mechanical properties of the radial and chordwise.