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A Two-Way Shape Memory Study on Ni-Rich NiTi Shape Memory Alloy by Combination of the All-Round Treatment and the R-Phase Transformation

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Abstract

Ni4Ti3 precipitates are formed in Ni-rich NiTi shape memory alloys (SMAs) after a certain heat treatment. Such a treatment then results in the changed phase transformation behavior of the alloy switching from the one-step reversible phase change B2 ↔ B19′ to the two-step, B2 ↔ R ↔ B19′, phase change. The present study reports a two-way shape memory (TWSM) due to an all-round treatment followed by an R-phase constraint aging at room temperature. The enhanced TWSM behavior was observed upon temperature cycling between 273 K (R-phase) and 77 K (B19′ phase). The effect of various constraint strains in R-phase aging by employing different diameters of the constraint ring was studied. However, the TWSM effect due to constraining the R-phase will be eliminated after a temperature rise of specimen to the fully parent phase (373 K).

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Acknowledgments

Authors want to acknowledge the supports by the Ministry of Science and Technology R. O. C. via project 104-2221-E-007-025 and also the support of the Czech Science Foundation via project 14-36566G.

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Authors and Affiliations

  1. Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30043, Taiwan

    Z. H. Wu & C. T. Hu

  2. Department of Functional Materials, Institute of Physics of the ASCR, Na Slovance 2, 182 21, Prague, Czech Republic

    D. Vokoun

  3. Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Kaohsiung, Taiwan

    C. C. Leu

Authors
  1. Z. H. Wu
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  2. D. Vokoun
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  3. C. C. Leu
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  4. C. T. Hu
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Correspondence to D. Vokoun.

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Wu, Z.H., Vokoun, D., Leu, C.C. et al. A Two-Way Shape Memory Study on Ni-Rich NiTi Shape Memory Alloy by Combination of the All-Round Treatment and the R-Phase Transformation. J. of Materi Eng and Perform 26, 5801–5810 (2017). https://doi.org/10.1007/s11665-017-3059-y

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  • DOI: https://doi.org/10.1007/s11665-017-3059-y

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