|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||F-63: Mechanism of Eutectic Growth in Directional Solidification of an Al2O3/Y3Al5O12 Crystal
||Xu Wang, Dong Wang, Jingyang Wang, Langhong Lou, Jian Zhang
|On-Site Speaker (Planned)
The single crystal of Al2O3/Y3Al5O12 eutectic was prepared by an optical floating zone furnace. The microstructure evolution during directional solidification was investigated by electron backscattered diffraction and high resolution transition electron microscopy. It was found that interfacial energy played a predominant role in controlling the solidification behavior of the Al2O3/Y3Al5O12 eutectic crystal. Single crystal Al2O3 was obtained in a shorter growth distance than Y3Al5O12 during solidification, and the interfacial relationships of Al2O3 and YAG were parallel when their growth directions were not. The competitive growth behavior of Al2O3/Y3Al5O12 eutectic was well discussed and misfit between the two phases was calculated. A model of the Al2O3/Y3Al5O12 eutectic growth was proposed based on the microstructure evolution. This investigation provided a full understanding of the mechanism of binary Al2O3/Y3Al5O12 eutectic growth, and paved way for the design and preparation of large bulk eutectic ceramics.