Viewpoint: Tuning the Martensitic Transformation Mode in Shape Memory Ceramics via Mesostructure and Microstructure Design
Viewpoint: Tuning the Martensitic Transformation Mode in Shape Memory Ceramics via Mesostructure and Microstructure Design
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DOI：
10.1007/s40830-023-00430-4
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发表时间：
2023-03
影响因子：
2.2
通讯作者：
Donald Erb;H. Rauch;Kendall P. Knight;Hang Z. Yu
中科院分区：
文献类型：
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作者：
Donald Erb;H. Rauch;Kendall P. Knight;Hang Z. Yu
形状记忆和超弹性效应基于机械或热诱导的马氏体转变。在块状整体形状记忆材料中，这些效应的特征在于驱动力阈值，例如临界应力或临界温度，高于该驱动力阈值，转变在相对较窄的应力或温度窗口内完成。在这篇观点文章中，我们讨论了通过细观结构和微观结构设计调节宏观马氏体相变特性：在细观/微观结构形状记忆材料（尤其是形状记忆陶瓷）中，由于具有异质驱动力和低成核势垒，局部相变事件可以顺序发生而不是同时发生。这可以导致全局连续转变模式，而无需明确定义的临界应力或温度。基于力学建模和实验证据的见解，我们阐述了颗粒填料、金属基复合材料和蜂窝结构中的这种效应，并讨论了它如何为涉及驱动和能量耗散的应用带来新的可能性。
The shape memory and superelastic effects are based on mechanically or thermally induced martensitic transformation. In bulk monolithic shape memory materials, these effects are characterized by a driving force threshold, such as a critical stress or a critical temperature, above which the transformation is completed within a relatively narrow window of stress or temperature. In this viewpoint article, we discuss the tuning of macroscopic martensitic transformation characteristics via mesostructure and microstructure design: with heterogeneous driving force and low nucleation barrier in meso-/micro-structured shape memory materials, especially shape memory ceramics, local transformation events can occur sequentially rather than simultaneously. This can lead to a globally continuous transformation mode without well-defined critical stress or temperature. Based on the insights from mechanics modeling and experimental evidence, we illustrate this effect in granular packings, metal matrix composites, and cellular architectures, and discuss how it may unlock new possibilities for applications involving actuation and energy dissipation.