Insight into the complex coupled growth behavior of Al2O3/YAG eutectic ceramic based on the evolutions of microstructure and crystallographic texture |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China;1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Longzhong Laboratory, Xiangyang 441000, Hubei, China;1. School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an, People’s Republic of China;2. Tongchuan Qin Han ceramsite co., LTD, Tongchuan, People’s Republic of China;1. College of Science, Xi’an University of Posts and Telecommunications, Xi’an, Shaanxi 710121, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Institute of Advanced Structure Technology, Beijing Institute of Technology, Haidian District, 100081 Beijing, PR China;1. Key Laboratory of Special Functional Materials for Ecological Environment and Information, Hebei University of Technology, Ministry of Education, Tianjin 050019, People’s Republic of China;2. Huida Sanitary Ware Co., Ltd., Tangshan 063307, People’s Republic of China;3. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, People’s Republic of China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, PR China;2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, PR China;3. Department of Physics, International Centre of Quantum and Molecular Structures, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China;1. CEITEC BUT, Purkynova 123, Brno 612 00, Czech Republic;2. Institute of Physics of Materials, Czech Academy of Sciences, Zizkova 22, Brno 616 00, Czech Republic;3. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 616 69, Czech Republic |
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| Abstract: | Clarifying the dependence of microstructure and crystallographic texture on growth kinetics is critical concerns for mechanical properties prediction in complex faceted eutectic growth. In this study, we present the comprehensive investigations of microstructure and crystallographic texture characteristic in directionally solidified Al2O3/YAG eutectic that rely on its coupled growth mechanism. The growth mechanism of eutectic spacing is also well depicted by the Magnin-Kurz (MK) model associated with morphological criteria for branching in faceted phase. As increasing the solidification rate (10 µm/s～200 µm/s), the regularization tendency for irregular three-dimensional interpenetrated (TDI) structure in geometric category is stronger. Whereas, the enhanced kinetic undercooling increases the misorientation and interfacial energy, which is attributed to the fact that the growth kinetics is more dominant than the minimum interface energy in this work. Additionally, the fluctuation tendency of eutectic spacing and crystallographic orientation with the solidification rate is diametrically opposite. The colony structure consisting of coupled irregular eutectic is formed by the planar interface instability, and its formation mechanism is revealed by the misorientation distribution. This comprehensive research contributes to the design of high-performance eutectic ceramics considering the influence of microstructural features and crystallographic growth modes. |
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| Keywords: | Crystallographic orientation relationship Interfacial energy Fluctuation behavior Colony structure |
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