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Abstract Droplets of Al-32. 7% Cu eutectic alloy were rapidly solidified during containerless processing in a 3m drop tube. Themicrostructural evolution of Al-Cu eutectic alloy depends strongly on droplet size. The eutectic growth morphology changes from regularlamellar eutectic to a kind of anomalous eutectic with the decrease in droplet size. This microstructural transition was analyzed within thecurrent theories of eutectic growth. The results indicate that there exists a critical velocity for eutectic growth beyond which anomalous eu-tectic 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 furtherinterpretation for the morphological transition.
The Microstructural evolution of Al-Cu eutectic alloys 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 results in that there is exists a critical velocity for eutectic growth beyond which anomalous eu-tectic 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 furtherinterpretation for the morphological transition.