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Influence of Different Thermo-mechanical Cycling Routes on Recovery Stresses of Annealed NiTi Wires

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Abstract

In this study, the influence of different thermo-mechanical cycling routes on recovery stresses of annealed NiTi wires has been investigated by using a dynamic mechanical analyzer. The as-received wire was annealed in Argon atmosphere in the temperature range of 350 to 900 °C. Differential scanning calorimeter was used to study the martensite transformation. In route I, the sample is deformed to 2% pre-strain and recovery stress is measured after unloading. In route II, the sample undergoes 3% deformation followed by a free shape recovery and then is reloaded to 2% pre-strain and recovery stress is measured after unloading. In route III, the sample undergoes a constrained thermal cycling at 3% pre-strain followed by a free shape recovery and then recovery stress is measured at 2% pre-strain. The results show that both route II and III can improve the recovery stresses. Route III has higher recovery stresses than route II for samples annealed at 550-700 °C. The improvements of recovery stresses under route II and III are partly attributed to the decrease of A s temperatures after thermo-mechanical cycling. Such information is essential for the proper use of NiTi alloys in smart structures, intelligent controllers, and memory devices.

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Acknowledgments

We gratefully acknowledge the support of the Natural Science Foundation of Liaoning Province of China under Grant No. 2015020224 and the ESF-Grant Mafesha, No. G-0652.05.

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University, Dalian, 116622, China

    X. J. Yan & Y. L. Ge

  2. Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44 bus 2450, 3001, Heverlee, Belgium

    J. Van Humbeeck

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Correspondence to X. J. Yan.

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Yan, X.J., Ge, Y.L. & Van Humbeeck, J. Influence of Different Thermo-mechanical Cycling Routes on Recovery Stresses of Annealed NiTi Wires. J. of Materi Eng and Perform 25, 267–273 (2016). https://doi.org/10.1007/s11665-015-1833-2

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  • DOI: https://doi.org/10.1007/s11665-015-1833-2

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