A unique "fishtail-like" four-way shape memory effect of compositionally graded NiTi

Meng, Qinglin; Wu, Zhigang; Bakhtiari, Reza; Shariat, Bashir S.; Yang, Hong; Liu, Yinong; Tae-hyun Nam

doi:10.1016/j.scriptamat.2016.09.007

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A unique "fishtail-like" four-way shape memory effect of compositionally graded NiTi

Meng, Qinglin;
Wu, Zhigang;
Bakhtiari, Reza;
Shariat, Bashir S.;
Yang, Hong;
... Tae-hyun Nam;
외 1명

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초록

This paper reports a complex four-way shape memory effect of a compositionally graded NiTi thin plate. The composition gradient is created by surface diffusion of Ni into the plate. After a 15% tensile deformation pre-treatment, the compositionally graded plate exhibits a complex four-way shape memory effect in. bending mode, by which the metal exhibits a back-and-forth shape change upon a complete thermal cycle. This is analogous to a "fishtail-like" motion, resulting from the sequential transformation through the thickness of the plate as dictated by Ni content gradient. Such "four-way" shape memory effect has not been achieved in NiTi alloys before. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

키워드

Shape memory alloy (SMA); Functionally graded materials (FGM); Two-way shape memory effect; INDUCED MARTENSITIC-TRANSFORMATION; ZN-AL ALLOYS; THIN-FILMS; DEFORMATION; STRESS; STABILIZATION; TINI; REORIENTATION

제목: A unique "fishtail-like" four-way shape memory effect of compositionally graded NiTi

저자: Meng, Qinglin; Wu, Zhigang; Bakhtiari, Reza; Shariat, Bashir S.; Yang, Hong; Liu, Yinong; Tae-hyun Nam

DOI: 10.1016/j.scriptamat.2016.09.007

발행일: 2017-01-15

유형: Article

저널명: Scripta Materialia

권: 127

페이지: 84 ~ 87