This research evaluates the impact of adding 0.13% copper to AA2024, AA6061, and AA7075 aluminum alloys by examining their mechanical properties through tensile, flexural, and hardness tests. The results reveal that the AA2024 compound exhibited significant improvements in strength and hardness due to the development of CuAl₂, which strengthens the aluminum metallographic matrix. These findings align with recent studies that present the adequacy of copper in the reinforcement of the 2000 series compounds. Conversely, the AA7075 compound, known for its high initial strength, demonstrated reduced mechanical load capacity after adding copper, likely due to microstructural changes that negatively influence its mechanical properties. This behavior has been seen in research demonstrating the arrangement of brittle stages after copper expansion in combinations of the 7000 series. Compound AA6061 showed moderate improvements, suggesting that the addition of copper contributes to the development of secondary phases in the material’s microstructure that increase strength, albeit less significantly than in AA2024. These findings underscore the importance of considering the base structure of composite materials when incorporating additional components to enhance mechanical properties.