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Droplets of pure silicon were dropped onto a chill plate of copper within an electromagnetic levitation facility. Through observation of morphologies grown on the quenched surfaces, direct evidence of growth mode transition from a continuous form to a lateral form was provided.
Solidification of 0.1–1.0mm diameter droplets of Al–50at.%Si hypereutectic alloy was achieved in a 3m drop tube. Phase morphologies of deeply etched sections of the solidified samples with different diameters are examined. With decreasing of the diameter of the droplets, refinement of the primary silicon phase is observed. A tendency for the primary silicon crystals to form granular morphology is...
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