Effect of solution treatment on microstructures and mechanical properties of 7136 aluminum alloy

The effects of solution treatment on the microstructures and mechanical properties of 7l36 aluminum alloy extrusion plate were studied by OM, SEM, DSC and room temperature tensile test. The results show that the higher the solution temperature and longer time, the more coarse second phase dissolved. The overheated structure appears in the alloys when the quenching temperature is at 480 degree C. The trend of microstructure coarsening and recrystallization appears when prolongating the solution time is extended. The suited solution of the alloy is single-stage solution of 470 degree C, 4 h. After solution and peak aging of (470 degree C, 4 h)+(120 degree C, 24 h), the ultimate tensile strength, yield strength and elongation are 698 MPa, 647 MPa and 12. 8%, respectively.