Hypoeutectic Al–Si alloy was modified by Al–5Ti and Al–3P alloys. The microstructure, fracture morphology, and mechanical properties of the alloys were characterized using optical microscopy, scanning electron microscopy, and a universal electronic testing machine. The results show that there was more primary α-Al phase in the Al–7Si alloy modified with 0.5 wt.% Al–5Ti and Al–3P compared to that modified with 0.5 wt.% Al–5Ti alone. With increased Al–3P, the area fraction of α-Al phase in the complex modified Al–7Si alloy decreased. For 0.1 wt.% Al–3P, eutectic silicon appeared as short rods or flakes, distributed uniformly in the Al–7Si alloy. Compared with hypoeutectic Al–Si alloy modified with 0.5 wt.% Al–5Ti, the relative amount of α-Al phase decreased and the amount of eutectic microstructure increased in the complex modified alloy with increased Si content. The complex modified Al–7Si alloy exhibited 10% higher tensile strength, 21% higher elongation, and presented ductile fracture.
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The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (No. 51571039).
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