Grain-refining mechanism in hypereutectic Al-20Si alloy with minor Sr - Sc - La and ultrasonic vibration treatment

The grain-refining mechanism with minor Sr - Sc La and ultrasonic vibration treatment (UVT) in the hypereutectic Al-20Si alloy were studied. results demonstrated that microstructure of could be refined significantly, further improve its mechanical properties. desirable refinement was achieved using 0.2% Sr, 0.15% Sc, 0.3% under UVT, achieving highest grain circularity coefficient, hardness, elongation, area reduction. tensile strength largest addition La. findings this study provide theoretical experimental guidelines for fabrication structural materials application automotive, aerospace, deep-sea equipment.