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A unique "fishtail-like" four-way shape memory effect of compositionally graded NiTi
- Authors
- Meng, Qinglin; Wu, Zhigang; Bakhtiari, Reza; Shariat, Bashir S.; Yang, Hong; Liu, Yinong; Tae-hyun Nam
- Issue Date
- 15-Jan-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Shape memory alloy (SMA); Functionally graded materials (FGM); Two-way shape memory effect
- Citation
- SCRIPTA MATERIALIA, v.127, pp 84 - 87
- Pages
- 4
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 127
- Start Page
- 84
- End Page
- 87
- ISSN
- 1359-6462
- Abstract
- 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.
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