Abstract: The NiTi shape memory alloys (SMA) have been increasingly used in different domains, such as aerospace, automotive, robotic,and biomedical applications, for their unique properties. Among the developed SMA products, super-fine NiTi SMA wires have potential applications in structural health monitoring and micro-drive system due to their excellent shape memory effect, superelasticity and resistance characteristics, and so on. However, the stability of super-fine SMA wires is still a problem. Cyclic tensile tests of super-fine SMA wires (25 μm), which were martensite at room temperature, were conducted. The effects of the training process, cyclic loading-unloading numbers, and static treatment on the mechanical properties and stability of super-fine SMA wires were investigated. The mechanical parameters were analyzed with different trai-ning processes and cyclic loading-unloading numbers, such as residual strain, hysteretic energy, secant stiffness, and equivalent damping ratio. The results indicated that the detwinning process was shortened with the increase of training amplitudes and cyclic loading and unloading numbers, while austenitic mechanical properties were not affected. Methods for restoring mechanical properties of super-fine SMA wires after static treatment were proposed. The results of this paper can provide the experimental basis for the application of super-fine shape memory alloy wires in engineering.
杨博恒, 钱辉, 师亦飞, 康莉萍. 不同训练条件下NiTi形状记忆合金超细丝力学性能的稳定性[J]. 材料导报, 2022, 36(4): 21010093-5.
YANG Boheng, QIAN Hui, SHI Yifei, KANG Liping. Stability of Mechanical Properties of Super-fine NiTi Shape Memory Alloy Wires Under Different Cyclic Training Conditions. Materials Reports, 2022, 36(4): 21010093-5.
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2022, Vol. 36 
