Abstract
In this paper, the effect of the heat treatment process on mechanical properties is systematically investigated, and the optimal aging process is obtained. Transmission Electron Microscopy (TEM) was employed to investigate the microstructure and clarify the microstructural evolution during aging. We found that the σb, σ0.2, δ, and Hardness of Al–Cu–Mg alloys exhibited 476.2 ± 4.4 MPa, 376.2 ± 6.2 MPa, 14.9 ± 0.5%, and 151.2 ± 1.5HV after T6 heat treatment(solution treatment + aging treatment of deformed aluminum alloy), respectively. The TEM results indicated that the precipitate evolution is α-Al→GPB→S'→S during aging. When the ratio of the fractions of the GP: S phase is 10.58, Al–Cu–Mg alloy got the best mechanical properties.
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