期刊
SCRIPTA MATERIALIA
卷 187, 期 -, 页码 424-427出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.06.069
关键词
Al2O3/SmAlO3 eutectic ceramics; Directional solidification; Interfacial structure; HRTEM
类别
资金
- National Natural Science Foundation of China [51804252, 51701156]
- Foundation of Equipment Pre-research Area [6140923040203]
- Hong Kong Scholars Program [2019-067]
Directionally solidified Al2O3/SmAlO3 (SAP) eutectic ceramics were successfully prepared with an optical floating zone furnace. The crystallographic orientation and interfacial structures were investigated by electron backscattered diffraction and transmission electron microscopy. It was found that Al2O3 has one preferred growth direction but the SAP has two. The preferred growth direction of the directionally solidified Al2O3/SAP eutectic ceramics was < 10 (1) over bar0 > Al2O3 parallel to < 100 > SAP parallel to < 011 > SAP. The near-coincidence site lattice models were proposed to interpret the intergrowth of the two SAPs. It was found that the two interfaces have nearly the same volume strain, validating the coexistence of both orientation relationships. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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