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Wang, Bin; Chen, Yulin; Xu, Zhiyuan; Chen, Chen; Zhang, Jian
Scripta materialia, 05/2024, Volume: 245Journal Article
Ti-xNb (x < 24) shape memory alloys (SMAs) typically exhibit triangular self-accommodation morphology of α” martensite after thermal β→α” transformation, whereas α” variants contain no internal twins. In present work, we found an interesting transition from the self-accommodated triangular into nano-twinned martensite morphology during tensile deformation in solution treated Ti-20Nb-(3, 6)Zr SMAs. Such transition was not observed in binary Ti-20Nb. Moreover, the superelasticity in the deformed Ti-20Nb-(3, 6)Zr SMAs is greatly improved by several times as compared to that in Ti-20Nb. The underlying mechanisms of superelasticity and its improvement are briefly discussed based on the phenomenological models concerning the self-accommodation morphology transition. Display omitted
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