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This research investigated the effects of Er addition (0–1 wt.%), cooling rate and hot extrusion on the microstructure, hardness and tensile properties of Al-15 wt.% Mg 2 Si in-situ composite. The results show that addition of Er with high concentrations changes primary Mg 2 Si particles from irregularly shaped to polygonal shaped and also transforms needle-shaped Al 5 FeSi compounds into a short rod morphology. Microstructural studies revealed that water-cooling is more beneficial to acquire polygon shaped primary Mg 2 Si and fish-bone Al 3 Er. Through hot extrusion, the networks of eutectic Mg 2 Si phase and fish-bone Al 3 Er compound are broken. In addition, the results of tensile testing show that both Er addition and water-cooling improve the ultimate tensile strength and elongation. The optimum tensile behavior was achieved by adding 0.6 wt.% Er to the water-cooled Al–Mg 2 Si composite after hot extrusion.

Microstructure optimization and mechanical properties of lightweight Al–Mg 2 Si in-situ composite