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Indentation-induced two-way shape memory surfaces

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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 shapememory 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.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan, 48824, USA

    Xueling Fei, Yijun Zhang & David S. Grummon

  2. Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky, 40506-0046, USA

    Yang-Tse Cheng

Authors
  1. Xueling Fei
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  2. Yijun Zhang
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  3. David S. Grummon
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  4. Yang-Tse Cheng
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Correspondence to Xueling Fei.

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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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Fei, X., Zhang, Y., Grummon, D.S. et al. Indentation-induced two-way shape memory surfaces. Journal of Materials Research 24, 823–830 (2009). https://doi.org/10.1557/jmr.2009.0101

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