NiTi 形状记忆合金热-力耦合循环变形行为宏微观实验和理论研究进展

本文对NiTi形状记忆合金热-力耦合循环变形行为研究的最新进展进行综述和评价。首先总结NiTi形状记忆合金在循环加载条件下的单轴、非比例多轴循环变形特性以及强烈的热-力耦合特性，阐述NiTi形状记忆合金在循环变形过程中出现功能性劣化的微观机理；然后，讨论在宏观和细观尺度上建立的三类NiTi形状记忆合金典型的循环本构模型，并评述代表性模型的预测能力；最后，总结已有研究存在的不足，对相关问题的进一步研究提出建议。在本构模型方面主要介绍了作者及其合作者在基于晶体塑性的热-力耦合循环本构模型方面的工作，突出了多种非弹性变形机制和强烈热-力耦合行为对形状记忆合金循环变形行为的影响。

Progress in Thermo-mechanical Cyclic Deformation of NiTi Shape Memory Alloy: Macroscopic/Microscopic Experiments and Theory

Progress in the studies on the thermo-mechanically coupled cyclic deformation of NiTi shape memory alloys (SMAs) is reviewed and commented. At first, the uniaxial and multiaxial cyclic deformation of NiTi SMAs and its strong thermo-mechanically coupled effect are summarized, and the physical mechanism of functional degeneration during the cyclic deformation is outlined; then, three types of cyclic constitutive models constructed in the macroscopic and microscopic senses, are addressed, and the capabilities of representative models to describe the thermo-mechanical cyclic deformation of NiTi SMAs are verified; finally, some suggestions are presented for the future work by summarizing the shortcomings of existing researches. In the content about the constitutive model, the crystal plasticity based thermo-mechanical coupling ones proposed by the authors and their co-workers are mainly introduced, and the effects of multiple inelastic mechanisms and strongly nonlinear thermo-mechanical coupling on the cyclic deformation of NiTi SMAs.