During the directional solidification of AlO-based eutectic ceramic composites, crystallographic orientation control is a promising method for tailoring the performances of composite parts. However, despite its importance in the fabrication of texture-controlled structural parts, the stable growth of the eutectic crystallographic texture for long distance (growth distance from 30 mm to 120 mm) in ceramic composite system is not widely understood. Herein, the competition and stability of crystallographic texture for AlO/YAG eutectic ceramic composite induced by different seeds using the Czochralski (CZ) technique were investigated. When the eutectic composites induced by different single crystalline AlO seeds, coarse AlO particles and uniform eutectic structure appeared alternately below the seeds. While the eutectic ceramic composite induced by YAG seed has a memory effect on the stability of its microstructure and morphology. We demonstrated that the eutectic ceramic composites induced by the AlO and AlO seeds could stably inherit the seed orientation and grow as a single crystallographic texture with a low interfacial strain (<10 %). In particular, the stable evolution of crystallographic texture depended not only on the type of seeds but also on the mutual constraint of eutectic coupling growth. Furthermore, the nano-hardness, elastic modulus, and compressive strength (1600 °C) of the composites induced by different seeds have anisotropic characteristics. However, the bending strength was not sensitive to the change of crystallographic texture. It could maintain excellent high temperature stability, which was approximately 265–316 MPa from room temperature to 1600 °C. These results promote the development of high-performance AlO-based eutectic ceramic composites with anisotropic design using seeding technique to tailor their crystallographic texture.

中文翻译：

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使用单晶晶种的 Al2O3/YAG 共晶陶瓷复合材料的晶体结构和机械各向异性的稳定性

在 Al2O 基共晶陶瓷复合材料的定向凝固过程中，晶体取向控制是调整复合材料零件性能的一种有前景的方法。然而，尽管共晶织构在织构控制结构零件的制造中很重要，但其在陶瓷复合材料系统中长距离（生长距离从30毫米到120毫米）的稳定生长尚未得到广泛理解。在此，利用直拉（CZ）技术研究了不同晶种诱导的 Al2O3/YAG 共晶陶瓷复合材料晶体织构的竞争和稳定性。当不同单晶Al2O晶种诱导形成共晶复合材料时，晶种下方交替出现粗大的Al2O颗粒和均匀的共晶组织。而YAG晶种诱发的共晶陶瓷复合材料对其微观结构和形貌的稳定性具有记忆效应。我们证明，由 Al2O3 和 Al2O3 晶种诱导的共晶陶瓷复合材料可以稳定地继承晶种取向，并以低界面应变 (<10%) 的单一晶体织构生长。特别是，晶体织构的稳定演化不仅取决于晶种类型，还取决于共晶耦合生长的相互制约。此外，不同种子诱导的复合材料的纳米硬度、弹性模量和压缩强度（1600℃）具有各向异性特征。然而，弯曲强度对晶体织构的变化并不敏感。它可以保持优异的高温稳定性，从室温到1600℃约为265-316 MPa。这些结果促进了高性能 Al2O 基共晶陶瓷复合材料的开发，该复合材料具有各向异性设计，使用晶种技术来定制其晶体结构。