| Microstructure transition of Al-Cu eutectic alloy during containerless rapid solidification |
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| 作者姓名： | LU Yongjun WANG Nang WEI Bingbo |
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| 作者单位： | Laboratory of Materials Science in Space, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China,Laboratory of Materials Science in Space, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China,Laboratory of Materials Science in Space, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant Nos. 50221101, 50101010 and 50071009) and Fok Ying-tung Education Foundation (Grant No. 71044) |
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| 摘 要： | 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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| 关 键 词： | Al-Cu alloy crystal growth microstructure phase transition |
Microstructure transition of Al-Cu eutectic alloy during containerless rapid solidification |
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| LU Yongjun,WANG Nang,WEI Bingbo.Microstructure transition of Al-Cu eutectic alloy during containerless rapid solidification[J].Progress in Natural Science,2003,13(2):130-134. |
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| Authors: | LU Yongjun WANG Nang WEI Bingbo |
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| Institution: | Laboratory of Materials Science in Space, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
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| 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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| Keywords: | Al-Cu alloy crystal growth microstructure phase transition |
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