The effect of Y₂O₃:MgO ratio on the microstructures, optical and mechanical properties of the Y₂O₃-MgO composites were investigated. Although the dense Y₂O₃-MgO composites were successfully fabricated in various Y₂O₃:MgO ratios using the spark-plasma-sintering (SPS) technique, the Y₂O₃:MgO ratio significantly influenced the microstructures and the optical/mechanical properties of the composites. Fine grain size was obtained in the composite with Y₂O₃:MgO = 50:50 owing to the effective pinning force caused by the homogenous two phase microstructure. The SPSed dense composites showed good transmittance in the wide wavelength range from visible to infrared (IR). The monolithic Y₂O₃ polycrystal, that is Y₂O₃:MgO = 100:0, showed the highest transmittance of 62.3 % at 600 nm and 84.3 % at 5 μm. Although the IR transmittance is independent of the Y₂O₃:MgO ratio, the visible transmittance decreased with the MgO particle dispersion. Among the Y₂O₃-MgO composites, the higher visible transmittance was obtained in the composite with Y₂O₃:MgO = 50:50 than those of the other two composites with Y₂O₃:MgO = 30:70 and 70:30 due to its smallest grain size. In contrast to the transmittance, the hardness H_v and toughness K_IC tend to increase with increasing the MgO fraction irrespective of the grain size; both H_v and K_IC increased from 9.6 GPa and 1.1 MPa m^1/2 for the monolithic Y₂O₃ to 12.7 GPa and 2.5 MPa m^1/2 for the composite with Y₂O₃/MgO = 30:70, respectively. The enhanced hardness and toughness of the composite can be interpreted dominantly by the mixture rule as a function of the volume fraction of the MgO phase.

研究了Y ₂ O ₃：MgO比对Y ₂ O ₃ -MgO复合材料的微观结构，光学和力学性能的影响。尽管使用火花等离子体烧结（SPS）技术成功地以各种Y ₂ O ₃：MgO比率成功制备了致密的Y ₂ O ₃ -MgO复合材料，但Y ₂ O ₃：MgO比率显着影响了微观结构和光学/复合材料的机械性能。在具有Y ₂ O ₃的复合物中获得了细晶粒度：MgO = 50:50是由于均质的两相微结构引起的有效钉扎力。SPSed致密复合材料在从可见光到红外（IR）的宽波长范围内均显示出良好的透射率。Y ₂ O ₃：MgO = 100：0的单片Y ₂ O ₃多晶体在600 nm处显示最高透射率，在5μm处显示最高透射率，为84.3％。尽管IR透射率与Y ₂ O ₃：MgO比无关，但是可见透射率随着MgO颗粒分散而降低。在Y ₂ O ₃ -MgO复合材料中，具有Y ₂ O ₃的复合材料具有较高的可见光透射率。：MgO = 50:50比Y ₂ O ₃：MgO = 30:70和70:30的其他两种复合材料的晶粒尺寸最小。与透射率相反，无论晶粒大小如何，随着MgO含量的增加，硬度H _v和韧性K _IC趋于增加。既ħ _v和ķ _IC从9.6 GPA和1.1兆帕米增加^1/2为单片ÿ ₂ ö ₃至12.7 GPA和2.5兆帕米^1/2为复合，其中Y ₂ ö ₃/ MgO分别为30:70。复合材料增强的硬度和韧性可以通过混合规则主要解释为MgO相体积分数的函数。