Abstract
The microstructure, fracture morphology and mechanical properties of Al-10Si alloy modified with Al-5Ti were analyzed and tested by optical microscopy, scanning electron microscopy, and universal electronic testing machine. Compared with unmodified Al-10Si alloy, the area fraction of α-Al phase in Al-10Si alloy modified at 740 °C increased first and then decreased with the increase of added amounts of Al-5Ti, and reached the maximum when the added amount of Al-5Ti was 0.5wt.%. When the modification temperature increased from 700 to 740 °C with Al-5Ti being fixed at 0.5wt.%, α-Al dendrites were refined obviously and the area fraction remarkably increased. Compared with unmodified Al-10Si alloy, the ultimate tensile strength and elongation of the alloy modified at 740 °C with 0.5wt.% Al-5Ti increased by 9% and 49%, respectively. The fracture surface of modified alloy predominantly exhibited ductile fracture.
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