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Improved Functional Properties and Efficiencies of Nitinol Wires Under High-Performance Shape Memory Effect (HP-SME)

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Abstract

Martensitic Ti-rich NiTi intermetallics are broadly used in various cyclic applications as actuators, which exploit the shape memory effect (SME). Recently, a new approach for exploiting austenitic Ni-rich NiTi shape memory alloys as actuators was proposed and named high-performance shape memory effect (HP-SME). HP-SME is based on thermal recovery of de-twinned martensite produced by mechanical loading of the parent phase. The aim of the manuscript consists in evaluating and comparing the fatigue and actuation properties of austenitic HP-SME wires and conventional martensitic SME wires. The effect of the thermomechanical cycling on the actuation response and the changes in the electrical resistivity of both shape memory materials were studied by performing the actuation tests at different stages of the fatigue life. Finally, the changes in the transition temperatures before and after cycling were also investigated by differential calorimetric tests.

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Acknowledgments

The authors gratefully thank SAES Getters Spa for material supply.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Politecnico di Milano, Via La Masa 1, Milan, Italy

    R. Casati, F. Saghafi & M. Vedani

  2. National Research Council, Institute of Condensed Matter Chemistry and Technologies for Energy, CNR-ICMATE, Corso Promessi Sposi 29, Lecco, Italy

    C. A. Biffi & A. Tuissi

Authors
  1. R. Casati
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  2. F. Saghafi
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  3. C. A. Biffi
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  4. M. Vedani
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  5. A. Tuissi
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Correspondence to R. Casati.

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Casati, R., Saghafi, F., Biffi, C.A. et al. Improved Functional Properties and Efficiencies of Nitinol Wires Under High-Performance Shape Memory Effect (HP-SME). J. of Materi Eng and Perform 26, 4964–4969 (2017). https://doi.org/10.1007/s11665-017-2927-9

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  • DOI: https://doi.org/10.1007/s11665-017-2927-9

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