Abstract
AZ31B magnesium alloy ring with a large diameter and a thick wall was fabricated using a centrifugal casting technique. We focus on the incipient motion of the primary α-Mg phase and the microstructures of the ring. The microstructures and tensile properties of the ring were studied and it was compared with conventional casting. It is demonstrated that in the case of dendritic growth, both the primary and secondary arms were broken by the cyclical centrifugal force field and the flow shear of the semisolid slurry, and the primary phase with dendritic morphology in the centrifugal casting of AZ31B magnesium alloy has readily transformed into a spherical nucleus. As a consequence, the microstructures of the ring by centrifugal casting are formed in equiaxed grains and their size significantly refined. Therefore, there is a semisolid slurry preparation process within the solidification process of centrifugal casting.
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