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samples were produced at CANMET-MTL, and the casting parameters were as follows: 725°C casting temperature, 350°C to 400°C mold temperature, 2-to 3-second filling time, and 0.125 MPa filling pressure. The cooling rate for the LPDC samples was about 0.8°C/s. The HPDC samples were cast at the Gibbs Die Casting Corporation (Henderson, KY), and the casting parameters were as follows: 7.6 m/s injection speed, 690°C metal temperature, and 230°C mold temperature. The cooling rate of the HPDC sample was estimated to be at least two orders of magnitude faster than that of the LPDC sample.Metallographic samples were examined first with an optical microscope and then in a PHILIPS* XL30 scanning *PHILIPS is a trademark of

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.

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