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Indentation-induced two-way shape-memory effect in aged Ti−50.9 at.% Ni

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Abstract

In this study, Vickers indentation was used to investigate the two-way shape-memory effect (TWSME) in an austenitic Ti-50.9 at.% Ni alloy, exposed to different heat treatments. Three aging treatments were used to manipulate the size of Ti3Ni4 precipitates. All samples were Vickers indented, and the indent depth was investigated as function of thermal cycling. The TWSME was found only in the material aged at 400 °C, which contained coherent precipitates. Thermal cycling shows stable TWSME, however, heating well above the austenite finish temperature lead to permanent austenitic protrusions. The results indicate that stabilized martensite plays a critical role in creating TWSME surfaces.

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Acknowledgments

The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP/2007-2013)/ERC Grant Agreement no. 340929. CPF gratefully acknowledges support of this work from the National Science Foundation (NSF) CAREER award (grant no. DMR-1255603), as well as the University of Wyoming International Travel Grant.

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Author notes

  1. Andreas S. Schneider

    Present address: AG der Dillinger Hüttenwerke, Dillingen, Germany

Authors and Affiliations

  1. INM—Leibniz Institute for New Materials, Saarbrücken, 66123, Germany

    Mareike Frensemeier & Eduard Arzt

  2. Saarland University, Saarbrücken, 66123, Germany

    Mareike Frensemeier, Eduard Arzt & Andreas S. Schneider

  3. Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou, 215004, China

    Enwei Qin

  4. Department of Mechanical Engineering, University of Wyoming, Laramie, Wyoming, 82071, China

    Carl P. Frick

Authors
  1. Mareike Frensemeier
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  2. Eduard Arzt
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  3. Enwei Qin
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  4. Carl P. Frick
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  5. Andreas S. Schneider
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Correspondence to Mareike Frensemeier.

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Frensemeier, M., Arzt, E., Qin, E. et al. Indentation-induced two-way shape-memory effect in aged Ti−50.9 at.% Ni. MRS Communications 5, 77–82 (2015). https://doi.org/10.1557/mrc.2014.37

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  • DOI: https://doi.org/10.1557/mrc.2014.37

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