An Al₂O₃/Y₃Al₅O₁₂ eutectic ceramic was prepared with a c-axis sapphire seed by an optical floating zone furnace. The crystallographic relationships in the initial and the steady growth sections of the as-grown eutectic ceramic were investigated by electron backscattering diffraction and transmission electron microscopy. The corresponding results were: <111 > {101}Y₃Al₅O₁₂ || <0001 > {}Al₂O₃ and <110 > {}Y₃Al₅O₁₂ || < > {0001}Al₂O₃, respectively. The steady orientation of the latter one shows smaller planar disregistry. Interfacial strain played the decisive role in affecting the solidification behavior of the Al₂O₃/Y₃Al₅O₁₂ eutectic ceramic. The stability of interfaces with minimum interfacial strain and better ionic charge balance in irregular microstructure prevail upon the constraint of the seed. These results might cast light for the interfacial design of the Al₂O₃/Y₃Al₅O₁₂ binary eutectic ceramic.

中文翻译：

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界面能对定向凝固Al2O3 / YAG共晶陶瓷微观结构的影响

通过光学浮区炉制备具有c轴蓝宝石晶种的Al ₂ O ₃ / Y ₃ Al ₅ O ₁₂共晶陶瓷。通过电子背散射衍射和透射电子显微镜研究了共晶陶瓷的初始和稳定生长区的晶体学关系。相应的结果为：<111> {101} Y ₃ Al ₅ O ₁₂ || <0001> { } Al ₂ O ₃和<110> { } Y ₃ Al ₅ O ₁₂ || < > {0001}铝₂ O ₃。后者的稳定取向显示较小的平面偏移。界面应变在影响Al ₂ O ₃ / Y ₃ Al ₅ O ₁₂共晶陶瓷的凝固行为中起决定性作用。在不规则的微观结构中，具有最小界面应变和更好的离子电荷平衡的界面的稳定性主要取决于种子的约束。这些结果可能为Al ₂ O ₃ / Y ₃ Al ₅ O ₁₂二元共晶陶瓷的界面设计提供参考。