Fatigue Crack Propagation in Ceria-Partially-Stabilized Zirconia-Alumina Composites

本研究旨在探讨 氧化锆的加工、微观结构和循环疲劳行为 陶瓷.具体而言，研究的目标首先是， 了解这些转变中的循环疲劳机理 第二，控制这种机制， 与加工相关的微观结构变化。一些在- 室内处理的氧化铈部分稳定的氧化锆/氧化铝 复合材料将用于研究的作用， 裂纹屏蔽和成分、微观结构和 环境对循环疲劳裂纹扩展的影响。理论 相变增韧机理的计算 并进行区域屏蔽和裂纹桥接。是 预计结果将对我们的影响重大 对多晶陶瓷循环疲劳的认识 材料.

The proposed research is a study of the relationship between processing, microstructure, and cyclic fatigue behavior in zirconia ceramics. Specifically, the objective of the research is first, to understand the mechanism of cyclic fatigue in these transformation toughened materials, and second, to control this mechanism through processing related changes in the microstructure. A number of in- house processed ceria partially stabilized zirconia/alumina composites will be used in the study to investigate the role of crack shielding and the effects of composition, microstructure, and environment on cyclic fatigue crack propagation. Theoretical calculations on toughening by such mechanisms as transformation zone shielding and crack bridging will also be conducted. It is expected that the results will have a significant impact on our understanding of cyclic fatigue in polycrystalline ceramic materials.