“In the field of aluminum alloys, researchers have studied the effect of Sc addition on the phase transformation and mechanical properties of Al Cu Mg alloys through thermodynamic calculations and microstructure characterization. The results indicate that the solidification path of Sc containing alloys is: L → L+α - Al → L+α - Al+Al3Sc → L+α - Al+W → α - Al+θ+W, with precipitation sequences of Al3Sc, W, and θ phases. To further control the generation of W phase and ensure sufficient production of Al3Sc or Al3 (Sc, Zr) in the alloy, the amount of Sc added should not exceed 0.3%. Meanwhile, the eutectic transformation (W →θ+Al3Sc) during the solidification process was preliminarily verified through experimental methods. Through the dual stage homogenization heat treatment process, the yield strength, tensile strength, and elongation of Al Cu Mg - (Sc) alloy were increased by 7.8%, 11.2%, and 40.6%, respectively.”