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本研究探索了光悬浮区熔法制备Al2O3/Er3Al5O12(ErAG)和Al2O3/Yb3Al5O12(YbAG)定向凝固共晶陶瓷.在10 mm/h的抽拉速率下成功获得了凝固组织均匀、内部无裂纹或孔洞的高质量共晶陶瓷.通过高分辨三维X射线衍射仪研究了Al2O3和RE3Al5O12在三维空间的分布与组织结构;利用电子背散射衍射技术分析了定向凝固末期Al2O3和RE3Al5O12两相的晶体学择优取向和相界面关系.力学性能表征结果显示,Al2O3/ErAG和Al2O3/YbAG具有优异的力学性能,二者的维氏硬度分别为(13.5±0.4)和(12.8±0.1)GPa;断裂韧性分别为(3.0±0.2)和(3.2±0.1)MPa·m1/2.“,”Al2O3/Er3Al5O12(ErAG) and Al2O3/Yb3Al5O12(YbAG) eutectic rods with fine and homogeneous microstructure, free from cracks or pores, were directionally solidified using optical floating zone method at growth rate of 10 mm/h. The crystallographic orientation, preferred orientation, and 3D distribution of Al2O3 and Er3Al5O12/Yb3Al5O12 phases in the terminal growth zone of Al2O3/ErAG and Al2O3/YbAG eutectics were investigated by EBSD and high-resolution X-ray microscope. Vickers hardness of the as-prepared Al2O3/ErAG and Al2O3/YbAG eutectics are determined as (13.5±0.4) and (12.8±0.1) GPa, respectively. The fracture toughness results of Al2O3/ErAG and Al2O3/YbAG are (3.0±0.2) and (3.2±0.1) MPa·m1/2, respectively.