Fundamental Experimental and Theoretical Studies on the Transformability and Toughenability of Zirconia Based Ceramics

本方案结合了一位陶艺家、一位化学家和一位应用数学家的实验和理论努力，寻求对氧化锆和萤石相关材料相稳定性基础的基本理解；探讨了相变增韧陶瓷疲劳行为的起源和适当的本构关系的发展。EXAFS和XANES技术将用于协调氧化锆多晶的力学性能。分析和计算模型将辅以变形和断裂实验，在单调，循环，高应变率和高压加载条件下。%%%%本研究有望为氧化锆陶瓷相变增韧的微观模拟提供新的见解。从剪胀塑性的观点出发。获得氧化物相稳定性的信息不仅对氧化锆陶瓷，而且对其他氧化物体系也很重要。

This proposal combines the experimental and theoretical efforts of one ceramist, one chemist, and one applied mathematician, to seek a fundamental understanding of the basis of phase stability of zirconia and fluorite related materials; and the origin of fatigue behavior and the development of appropriate constitutive relationships of transformation toughened ceramics. EXAFS and XANES techniques will be used to coordinate with the mechanical properties of zirconia polymorphs. Analytical and computational modelling will be complemented by deformation and fracture experiments, under monotonic, cyclic, high strain rate, and high pressure loading conditions. %%%% This research promises to provide new insights to the micromodelling of transformation toughening of zirconia ceramics. It starts from the viewpoint of shear-dilatant plasticity. Information to be gained on phase stability of oxides is important not only for zirconia ceramics, but also to other oxide systems as well.