Insight into tuning of ZrO2 distribution and mechanical properties of directionally solidified Al2O3/(5Re0.2)AG/ZrO2 eutectic ceramic composites

作者：Zhong, Yujie; Li, Zhe; Wang, Xu^*

来源：Composites Part B: Engineering , 2023, 266: 111016.

DOI：10.1016/j.compositesb.2023.111016

• Directional solidification
• High -entropy oxide ceramic composites
• Eutectics
• Orientation relationship
• Interfacial structure

A novel Al2O3/(Y0.2Er0.2Yb0.2Ho0.2Lu0.2)(3)Al5O12((5Re(0.2))AG)/ZrO2 eutectic high entropy oxide ceramic composite (HEOC) was prepared by the directional solidification technique. The Al2O3/(5Re(0.2))AG/ZrO2 eutectic HEOCs had a refined microstructure and different crystallographic orientation relationships of <10-10>Al2O3 || <103>(5Re(0.2))AG || <100>ZrO2, {11-20}Al2O3 || {100}(5Re(0.2))AG || {100}ZrO2, {0001}Al2O3 || {103}(5Re(0.2))AG || {100}ZrO2 compared to Al2O3/YAG/ZrO2 eutectic ceramic composites. ZrO2 was distributed more uniformly and dispersedly in Al2O3/(5Re(0.2))AG/ZrO2 eutectic HEOCs than in Al2O3/YAG/ZrO2 due to the similar volume strain of Al2O3/(5Re(0.2))AG, (5Re(0.2))AG/ZrO2 and Al2O3/ZrO2. As a result, mechanical performance including hardness, elastic modulus, and fracture toughness had been greatly improved because of the refined microstructure, tailored interfacial structure, and homogeneous distribution of ZrO2 caused by the introduction of the high entropy (5Re(0.2))AG.

• 单位
  重庆大学