Deformation induced <h>self</h>-<h>accommodation</h> morphology transition from triangular to nano-twinned martensite in <h>Ti</h>-<h>Nb</h>-Zr <h>shape memory alloys</h>

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Deformation induced self-accommodation morphology transition from triangular to nano-twinned martensite in Ti-Nb-Zr shape memory alloys

Wang, Bin; Chen, Yulin; Xu, Zhiyuan; Chen, Chen; Zhang, Jian

Scripta materialia, 05/2024, Volume: 245

Journal 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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Wang, Bin | Chen, Yulin | Xu, Zhiyuan | Chen, Chen | Zhang, Jian

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