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A semisolid forging study using A356 alloy was carried out to investigate the evolution of microstructuresaffected by the solid fraction, the forging pressure and the addition of Sr. The semisolid slurry for forgingwas made by an electromagnetic stirring method. Microstructures were evaluated at two typical positions of thesemisolid forged specimens: one is the region, where direct forging pressure is applied, and the other is theregion, where the slurry was squeezed and extruded indirectly. Microstructural characteristics, such as themorphology of the primary Al particles and the eutectic Si, were changed with the positions observed. Asthe solid fraction increased, the morphology of the primary Al particles was transformed from rosette-like toglobular. As the forging pressure increased, the size of eutectic Si became fine. An increase of the forgingpressure is speculated to improve the interfacial heat transfer coefficient between the semisolid slurry andthe mould wall, leading to an increase of the cooling rate on the growth of eutectic Si. The addition of Sris effective in modifying the morphology for eutectic Si, especially when the forging pressure was low.

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