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Al-Cu-Mg alloys have been widely used as structural materials for the aerospace industry due to their high tensile strength, toughness and good processability [1][2][3][4][5] . The hardness and strength of Al-Cu-Mg alloys are low, and pitting corrosion, intergranular corrosion (IGC) and local corrosion always occur in Al-Cu-Mg alloys [6,7] , which limit their industrial applications. Therefore, improving the comprehensive properties of Al-Cu-Mg alloys has always been the focus of research.Numerous studies have shown that heat treatment can significantly enhance the properties of Al-Cu-Mg alloys [8][9][10] . The standard T6 process can improve the mechanical properties of Al-Cu-Mg alloys, but the improvement is limited. To further improve the mechanical properties of the alloy, Lumley et al. [11] proposed the secondary aging process. The secondary aging process means that the standard T6 process is interrupted for a period at a lower temperature. The secondary aging process is called the T6I4 or T6I6

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