<p>Tests for electrical conductivity, intergranular corrosion, and electrochemical corrosion were used to examine the alloy’s mechanical properties. Tests for hardness and tensile strength were used to examine its resistance to corrosion. A scanning electron microscope was used to study the alloy’s corrosion depth, and a transmission electron microscope was used to study the alloy’s microstructural alterations. The research results show that the performance of the alloy after over-aging treatment changes at different deep cryogenic treatment positions. When T73+DCT2 treatment is performed, due to the volume shrinkage of the cryogenically treated alloy, a large amount of strain energy is stored inside the Al–Cu–Mg–Ag alloy, the solute atom precipitation power increases, and the precipitation of the second phase in the subsequent high-temperature aging is promoted, thereby obtaining more relatively densely distributed Ω phases, the microstructure is significantly optimized, and the comprehensive performance of the alloy is effectively improved.</p>