Function of modification and refinement of rapidly solidified master alloy Al—Ti—Sr

The function of modification and refinement of a master alloy Al—Ti—Sr solidified at cooling rates of 10 K s-1 or less and 103 K s-1 or greater for a hypoeutectic Al–10 wt% Si alloy has been studied. The master alloy Al–Ti–Sr solidified at a cooling rate of 103 K s-1 or greater presents a more marked function of modification and refinement than that solidified at a cooling rate of 10 K s-1 or less, both under the casting condition of a sand mould and a permanent mould. The addition amount of the master alloy is reduced by rapid solidification technology, keeping the same degree of modification and refinement.