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Influence of Aging Treatment on In-Situ Electrical Resistance Variation During Aging of Nickel-Rich NiTi Shape Memory Wires

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Abstract

Electrical resistance variations of Ni50.9Ti49.1 shape memory wires were studied during aging treatment at different temperatures via in-situ electrical resistance measurement. The results showed that during aging treatment, a cyclic behavior was observed in the electrical resistance variations, which could be related to the precipitation process. The evaluation of transition temperatures was conducted, after aging, using differential scanning calorimetry (DSC) analysis. The precipitation process is found to occur in four different stages. The results show that depending on the stress level around precipitates, two-, three-, or four-step martensitic transformation could be observed in DSC curves. In the points with maximum stress level (during precipitation process), four-step martensitic transformation is observed.

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Authors and Affiliations

  1. Research Center for Advanced Materials and Mineral Processing, Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran

    Kamel Kazemi-Choobi (Researcher) & Jafar Khalil-Allafi (Associate Professor)

  2. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

    Amin Elhami (Researcher) & Parviz Asadi (Ph.D.Student, Researcher)

  3. Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

    Parviz Asadi (Ph.D.Student, Researcher)

Authors
  1. Kamel Kazemi-Choobi
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  2. Jafar Khalil-Allafi
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  3. Amin Elhami
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  4. Parviz Asadi
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Correspondence to Kamel Kazemi-Choobi.

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Manuscript submitted January 12, 2013.

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Kazemi-Choobi, K., Khalil-Allafi, J., Elhami, A. et al. Influence of Aging Treatment on In-Situ Electrical Resistance Variation During Aging of Nickel-Rich NiTi Shape Memory Wires. Metall Mater Trans A 44, 4429–4433 (2013). https://doi.org/10.1007/s11661-013-1806-8

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  • DOI: https://doi.org/10.1007/s11661-013-1806-8

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