Abstract
Abstract Dendritic growth in Al-45% Ge hypoeutectic alloy has been investigated during free fall in a 3 m drop tube. Calculations indicate that the undercooling obtained for the falling Al-45 % Ge droplets ranges from 13 K to 201K. The maximum undercooling attains 0.27T L. With the increase of undercooling, the primary (Al) phase undergoes a columnar dendrite to equiaxed dendrite structural transition. According to the current rapid dendritic growth theory, the growth of primary Al phase is always controlled by solute diffusion.
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