Study of Fragment Behavior during Columnar-Equiaxed Transition of Hypoeutectic Alloy with Synchrotron Radiation

Abstract:

In the present work, solidification of hypoeutectic, eutectic and hypereutectic Al-Cu alloys was illustrated by synchrotron X ray imaging, and the CET of hypoeutectic alloy was picked out to thorough investigated. The mechanism of hypoeutectic dendrites fragment behaviors among the nucleation area was studied by in-situ imaging and first-principles computation. The results show that the density difference between the fragments and the enriched melt leads to the movement of the fragments. The ejected fragments contributed to the columnar-eutectic transition and expanded the breadth of mush zone in front of the solid/liquid interface.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 1743-1748
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.1743
• Online since: January 2012
• Authors: Jiao Zhang, Qing Dong, Yong Bing Dai, Bao De Sun, Hong Lan Xie
• Keywords: Columnar-To-Equiaxed Transition, Directional Solidification, Fragment, X-Ray Imaging

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