The results inferred from the present work show that Al₃Ti phase has a strong affinity to react with silicon (Si) in the molten alloy leading to formation of (Al,Si)₃Ti phase instead. This reaction is independent of the grain refiner type. The molten liquid temperature would change its morphology from platelets at 750°C into dendritic structure at 950°C. It has also been observed that (Al,Si)₃Ti phase platelets precipitate within the α‐aluminum dendrites, whereas TiB₂ or AlB₂ particles are released into the surrounding interdendritic regions. Introduction of the grain refiner, regardless its type, would cause change in the α‐aluminum dendrite morphology from an elongated to a more rounded form. The results also reveal that addition of 100 ppm B will reduce the initial grain size by ∼85% which is more than the effect of addition of 0.2%Ti in the form of Al‐10%Ti (about 65%). Elimination of undercooling is important to obtain the maximum grain refining effect.