Effect of Heat Treatment on Microstructure and Properties of Al-5.3Cu-0.8Mg-0.5Mn-0.6Ag Alloy

The effects of different heat-treatment processes on microstructure and properties of Al-5.3Cu-0.8Mg- 0.5Mn-0.6Ag (wt%) alloy were studied using optical microscope, electron probe and scanning electron microscope, differential thermal analysis and mechanical properties testing. Meanwhile, the diffusion kinetics of the alloy elements during homogenizing treatment was studied. The results show that the ideal heat treatment process is homogenizing at 500℃ for 12 h, solution at 525℃,then aging at 185℃ for 8 h,and the tensile strength and elongation of the alloy is 570 MPa and above 10%,respectively.