Abstract
Abstract Droplets of Al-32.7% Cu eutectic alloy were rapidly solidified during containerless processing in a 3 m drop tube. The microstructural evolution of Al-Cu eutectic alloy depends strongly on droplet size. The eutectic growth morphology changes from regular lamellar eutectic to a kind of anomalous eutectic with the decrease in droplet size. This microstructural transition was analyzed within the current theories of eutectic growth. The results indicate that there exists a critical velocity for eutectic growth beyond which anomalous eutectic appears. The coupled zone of the Al-Cu eutectic alloy system has been calculated on the basis of the Trivedi-Magnin-Kurz TMK eutectic growth and the Lipton-Kurz-Trivedi LKT Boettinger-Coriell-Trivedi BCT dendrite growth models, which provides a further interpretation for the morphological transition.
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