The microstructure and mechanical properties of the high-strength-ductility Al-Si-Cu-Mg alloy by squeeze casting were investigated. The results indicate that the alloy has excellent compactness

where the eutectic Si and Cu-containing phases are uniformly distributed in the cross-section of the specimen. After T6 treatment

the eutectic Si and Cu-containing phases are significantly spheroidized. The Cu/Si/Mg-containing nano-reinforced precipitations during aging can effectively increase the yield strength by more than 180 MPa

meanwhile the alloy can maintain desirable ductility. The yield strength

tensile strength of the squeeze casting Al-9 Si-3.4 Cu-0.15 Mg alloy can reach over 375 MPa and 423 MPa

elongation over 9% after T6 treatment.