| dc.description.abstract | In this study, optical microscope (OM), differential scanning thermal analyzer (DSC), conductivity measurement (%IACS), electron microscope (TEM, SEM), hardness measurement (HRB), tensile test (MTS), slow strain rate tensile test (SSRT), exfoliation corrosion (EXCO) and other measurement analysis to discuss the aging process (natural aging and artificial aging) on the influence of stress corrosion and exfoliation corrosion of AA2024 (Al-4.4Cu-1.5Mg) high strength aluminum alloys after solution quenching; the results show that in the T6 state and T7 state, the electrical conductivity, mechanical properties, exfoliation corrosion and stress corrosion of the alloy are not affected by natural aging, but the T7 state is compared to the T6 state, it can obviously improve the effect of anti-exfoliation corrosion and anti-stress corrosion, and the depth of exfoliation corrosion is greatly reduced from 480μm in T6 state to 220μm in T7 state. In the slow strain rate tensile test, the ductility loss rate of stress corrosion resistance of the alloy decreased from 70% in the T6 state to 34% in the T7 state. These results show that natural aging has no significant effect on the mechanical properties and corrosion resistance of the AA2024 alloy, but after T7 heat treatment, the corrosion resistance of the alloy is significantly better than T6 alloy. | en_US |