Abstract
ABSTRACTA study on the effect of different grain refiners and addition technique in Al-7%Si alloys was carried out. The results show that the Al3Ti phase reacts with silicon (Si) in the molten alloy forming a new compound (Al,Si)3Ti. This reaction is independent of the grain refiner addition technique. The temperature of the liquid metal causes a significant change in the Al3Ti phase morphology, which precipitates in the form of platelets at 750°C and in a dendritic form at 950°C. It has also been observed that while (Al,Si)3Ti phase platelets precipitate within the α-aluminum dendrites, the TiB2 or AlB2 particles are rejected into the surrounding interdendritic regions. The results also reveal that addition of 100ppm B will reduce the initial grain size by ~ 85%, which is more than the reduction obtained with the addition of 0.2%Ti in the form of Al-10%Ti (about 65%).
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