Crystallographically compatible ceramic shape memory materials

金属形状记忆（SM）合金独特的力学性能催生了许多不同的突破性应用。因此，将这些特性转移到陶瓷上将具有很大的科学和技术意义。这样的努力将同时导致脆性较低的陶瓷材料。此外，陶瓷将是在高温或恶劣环境下提供SM性能的有趣材料。因此，在本提案中，我将提出一项探索陶瓷的计划，该陶瓷将显示关键的SM特征，大可逆特征应变和高疲劳极限。我将利用机械相容性理论的预测，结合我们自己在金属NiTiCu薄膜上的经验，来确定有前途的陶瓷候选材料，这些材料在转变相之间表现出近乎理想的晶体相容性。这种高度的相容性，被认为是陶瓷材料必不可少的，应该会导致结构陶瓷材料中未知的可逆特征应变以及铁电陶瓷中的新功能。在这个项目中，特殊的应用前景将在两个陶瓷材料类别中展示。

The unique mechanical properties of metallic shape memory (SM) alloys have spawned many different ground breaking applications. It would thus be of much scientific as well as technological interest to transpose those properties to ceramics. Such an effort would concurrently lead to less brittle ceramic materials. Furthermore, ceramics would be interesting materials providing SM properties at high temperatures or in harsh environments. In this proposal I will thus present a plan to explore ceramics that will display the key SM characteristics, large reversible eigenstrains and high fatigue limits. I will utilize the predictions of the theory of mechanical compatibility in conjunction with our own experiences on metallic NiTiCu films to identify promising ceramic candidate materials, which exhibit next to ideal crystallographic compatibility between the transforming phases. This high degree of compatibility, judged to be essential for ceramic materials, should then result in as yet unknown reversible eigenstrains in structural ceramic materials as well as in new functionalities in ferroelectric ceramics. Within this project the exceptional application perspective will be demonstrated in both ceramic material classes.