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Indentation-induced two-way shape memory surfaces

Published online by Cambridge University Press:  31 January 2011

Xueling Fei,
Yijun Zhang,
David S. Grummon and
Yang-Tse Cheng
Xueling Fei*
Affiliation:
Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing, Michigan 48824
Yijun Zhang
Affiliation:
Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing, Michigan 48824
David S. Grummon
Affiliation:
Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing, Michigan 48824
Yang-Tse Cheng*
Affiliation:
Materials and Processes Laboratory, General Motors Research and Development Center, Warren, Michigan 48090
*
a) Address all correspondence to this author. e-mail feixueli@msu.edu
b) This author was an editor of this focus issue during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy.
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Abstract

A method is described for the creation of surfaces with cyclically reversible topographical form. Using spherical and cylindrical indenters applied to NiTi shape-memory alloys, an indentation-planarization technique is shown to result in a two-way shape memory effect that can drive flat-to-wavy surface transitions on changing temperature. First, it is shown that deep spherical indents, made in martensitic NiTi, exhibit pronounced two-way cyclic depth changes. After planarization, these two-way cyclic depth changes are converted to reversible surface protrusions, or “exdents.” Both indent depth changes and cyclic exdent amplitudes can be related to the existence of a subsurface deformation zone in which indentation has resulted in plastic strains beyond that which can be accomplished by martensite detwinning reactions. Cylindrical indentation leads to two-way displacements that are about twice as large as that for the spherical case. This is shown to be due to the larger deformation zone under cylindrical indents, as measured by incremental grinding experiments.

Keywords

MemoryMetalNanoindentation

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Type
Articles
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Journal of Materials Research , Volume 24 , Issue 3 , March 2009, pp. 823 - 830
Copyright
Copyright © Materials Research Society 2009

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References

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