Effect of solution treatment on microstructures and mechanical properties of 7150 aluminum alloy

The effects of solution treatment on the microstructures and mechanical properties of 7150 aluminum alloy extrusion plate were studied by OM,SEM,XRD,DSC and room temperature tensile test.The results show that the coarse second phase dissolves more adequately when the alloy is solution treated at higher temperature for longer time.The overheated structure appears in alloys when quenched at 480℃,and the temperature at which overheated structure appears cannot be enhanced by two-stage solution.The trend of microstructure coarsening and recrystallization appears with prolongating the solution time.The suited solution of the alloy is single-stage solution of 475℃,2 h.After solution and peak aging of(475℃,2 h) +(120℃,24 h) ,the ultimate tensile strength,yield strength and elongation are 650 MPa,600 MPa and 13.5%,respectively.