A melt drag twin roll caster (MDTRC) and a melt drag twin roll caster equipped with a cooling slope (MDTRC+CS) was devised in order to increase the casting speed of a strip. These casters are semi-solid strip casters. In the MDTRC, the upper side of the s

The morphology of the change of primary Al phase in A356 alloy by electromagnetic stirring and Sr modification of eutectic Si was investigated. The optimum stirring current for the dendritic structure of primary Al phase to change to the globular state was above 15 A. The average size of primary Al phase with the globular shape was 54 μm. The addition of Sr more than 50 ppm was found to modify remarkably the eutectic Si with the growth of the primary Al. The growth of the Al phase is probably due to the increase of stirring time through the extended mushy zone of the alloy with Sr addition. With the same amount of Sr addition, the eutectic Si size of stirred cast alloy was smaller than that of non-stirred alloy. This is presumed to be because of the morphology change of the eutectic Si particles by the homogenized Sr modification effect through the stirring.