摘要：In this work, effect of solution treatments on the microstructures and mechanical properties of industrial 7050 aluminum alloy thick plate was investigated by tensile test, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and transmission electron microscopy (TEM). The results show that the area fraction of residual phases decreases with increasing solution temperature from 475°C to 500°C. The overheating phenomenon identified by compound melting ball and crystal separating phase was observed at a temperature of 485°C or above. The compound melting balls are composed of S(Al2CuMg) phase dissolved with Zn atoms and Al matrix. The crystal separating phase is consisted of Al2Cu phase and the amorphous structure containing solute atom Mg. The maximum tensile strength of 529 MPa was obtained for the alloy solution treated at 475°C for 3h followed by peak aging at 120°C for 24h.
