Microstructure transition of Al-Cu eutectic alloy during containerless rapid solidification

被引：1

作者：

Lü, YJ ^{[1
]}

Wang, N ^{[1
]}

Wei, BB ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Dept Appl Phys, Lab Mat Sci Space, Xian 710072, Peoples R China

来源：

PROGRESS IN NATURAL SCIENCE | 2003年 / 13卷 / 02期

关键词：

Al-Cu alloy; crystal growth; microstructure; phase transition;

D O I：

10.1360/03jz9023

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页码：130 / 134

页数：5

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