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

In this paper, the influence of grain refinement (Al–5Ti–1B) and modification (Al–10Sr) on the microstructure, the morphology of iron-containing needle shape beta phase and mechanical properties of cast Al–12Si alloy has been reported. The grain refinement and modification transforms the needle shape morphology of the β-phase into Chinese script. Grain refinement and modification by addition of Ti and Sr respectively increased the quality index (Q) of the casting. Addition of 0.06 wt.% Sr resulted in a best combination of mechanical properties such as ultimate tensile strength and ductility.