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

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• 作者：Qinglin Meng^a ; Zhigang Wu^a ; ^{gordon.wu@uwa.edu.au" class="auth_mail" title="E-mail the corresponding author} ; Reza Bakhtiari^a ; Bashir S. Shariat^a ; Hong Yang^a ; Yinong Liu^a ; ^{yinong.liu@uwa.edu.au" class="auth_mail" title="E-mail the corresponding author} ; Tae-hyun Nam^b
• 关键词：Shape memory alloy (SMA) ; Functionally graded materials (FGM) ; Two-way shape memory effect
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：84-87
• 全文大小：841 K

文摘

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.