Abstract
Two-way shape memory effect (TWSME) has wide application prospect in the field of lightweight actuators. In the present study, an excellent TWSME with large magnitude and small cyclic degradation of NiTi wires is achieved by combining martensite deformation and nanocrystallization. The wires attain a maximum of 7.37% TWSME strain after pre-deformed to 11% and maintain a stable strain of 6.88% after 20 cycles. Microstructural characterization reveals that the excellent TWSME originates from both the dislocation structures induced by martensite deformation and nanocrystalline strengthened matrix. On one hand, the former provides adequate oriented stress field. On the other hand, the latter guarantees the availability of high-volume fraction of preferentially oriented martensite variations in subsequent thermal cycles through suppressing the formation of deformation twins, which are frequently discussed in coarse-grain NiTi.
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