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Two-way Shape Memory Surfaces

Published online by Cambridge University Press:  26 February 2011

Yijun Zhang,
Yang-Tse Cheng and
David S Grummon
Yijun Zhang
Affiliation:
zhangyij@msu.edu, Michigan State University, Chemical Engineering and Materials Science, 865 Kinkead Way,Apt 104, Albany, CA, 94706, United States
Yang-Tse Cheng
Affiliation:
yang.t.cheng@gm.com, General Motors Research and Development Center, Materials and Processes Laboratory, Warren, MI, 48090, United States
David S Grummon
Affiliation:
grummon@egr.msu.edu, Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing, MI, 48823, United States
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Abstract

Recently, we discovered that a two-way shape memory effect can be realized on NiTi shape memory alloy surfaces by spherical indentation. Either thermomechanical cycling or slip-plastic deformation under contact loading conditions is effective in inducing reversible indent depth changes: deeper indents in the low temperature martensitic phase and shallower indents in the high temperature austenitic phase [1, 2]. By planarization of these spherical indents to restore a flat surface, circular reversible surface protrusions appear upon heating and disappear upon cooling. Nano-protrusions are also realized in sputter deposited NiTi thin films. Furthermore, two-way reversible line protrusions are made by planarizing scratch tracks on a NiTi shape memory alloy. Shape memory surfaces can be exploited for a wide range of potential applications, including information storage, optical devices, and smart tribological surfaces.

Keywords

phase transformationstructuralthin film

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References

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