analysis required for advanced studies of grain refining, eutectic modification, etc. has been illustrated. This study will help to better understand the solidification mechanism of Al-Si alloys used for various casting component applications.

A mathematical model of the direct chill (DC) casting process for magnesium billets has been developed to predict the temperature in the billet, dummy block, and center pin using the commercial finiteelement (FE) package, ABAQUS. Boundary conditions used for primary and secondary cooling and interfacial cooling between the billet and dummy block were defined based on the literature and knowledge of the physical phenomena occurring during the process. Temperatures in the billet, mold, and dummy block, as well as sump depth, were measured for a series of casting conditions during a plant trial conducted at Timminco Metals. The data obtained during the plant trial were used to "fine-tune" and validate the model for a variety of industrial casting conditions.

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