On influence of Ti and Sr on microstructure, mechanical properties and quality index of cast eutectic Al-Si-Mg alloy

► Influence of grain refinement alloy and of Al-12Si alloy on morphology of Al-Fe-Si intermetallic compounds and mechanical properties was studied.► Addition of Al-Ti-B and Al-Sr master alloy promotes the development of Chinese script morphology at expense of the needlelike particles of β-phase. ► Optimum addition of grain refiner (Al-Ti-B) and modifier (Al-Sr) results in significant increase in tensile strength and ductility. ► Grain refinement and modification of the Al-12Si alloy increased the quality index (Q). Moreover, the effect of modification on quality index was more than grain refinement. ► It is recommended to add 0.06 wt.% Sr or 0.00125 wt.% Ti in Al-12Si alloy to achieve best combination of tensile strength and ductility of the alloy.