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Gamma-phase influence on shape memory properties in Ni-Mn-Co-Ga-Gd high-temperature shape memory alloys

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effect of γ-phase on two-way shape memory effect (TWSME) of polycrystalline Ni56Mn25-x Co x Ga18.9Gd0.1 alloys was investigated. The results show that an appropriate amount of ductile γ-phase significantly enhances the TWSME. The largest TWSME of 1.4% without training is observed in Ni56Mn21Co4Ga18.9Gd0.1 alloy, and this value is increased to 2.0% after thermomechanical training. The as-trained TWSME decays over the first five thermal cycles and then reaches a stable value as the number of cycles further increasing. Only the degradation of 0.2% is observed after 100 thermal cycles. The better TWSME and thermal stability are ascribed to the stable extra stress field formed by the plastically deformed γ-phase.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51601126), the Student’s Platform for Innovation and Entrepreneurship Training Program (No. 201710060118) and China Postdoctoral Science Foundation (No. 2016M601271).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China

    Wei Zhang, Xin Zhang, Qian Wang & Qing-Suo Liu

Authors
  1. Wei Zhang
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  2. Xin Zhang
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  3. Qian Wang
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  4. Qing-Suo Liu
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Correspondence to Xin Zhang or Qing-Suo Liu.

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Available online at http://link.springer.com/journal/40195.

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Zhang, W., Zhang, X., Wang, Q. et al. Gamma-phase influence on shape memory properties in Ni-Mn-Co-Ga-Gd high-temperature shape memory alloys. Acta Metall. Sin. (Engl. Lett.) 31, 471–476 (2018). https://doi.org/10.1007/s40195-017-0675-3

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  • DOI: https://doi.org/10.1007/s40195-017-0675-3

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