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The Effect of Low Temperature Aging and the Evolution of R-Phase in Ni-Rich NiTi

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Abstract

This study investigates the thermal and mechanical properties that arise from aging Ni-rich Ni–Ti (Nitinol) at temperatures below 250 °C, well below those commonly used to fabricate medical devices. We demonstrate that the Ni50.8–Ti49.2 composition decomposes at temperatures as low as room temperature and discuss the unusual changes in thermal and mechanical behaviors compared to common aging treatments, such as separation of Martensite and R-phase transformations. Using such aging treatments, superelasticity can be achieved without the presence of austenite at body temperature (Af > 45 °C, well above the body temperature). Furthermore, the influence of R-phase on mechanical response and the disparity between thermal and mechanical behavior is discussed in detail.

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Notes

  1. Recognizing that the R-phase is a martensitic transformation, the use of the capitalized term “Martensite” will refer exclusively to the B19′ martensitic phase.

  2. This range is typical for wire or tubing measured in tension. Values depend on deformation mode and crystallographic texture.

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Authors and Affiliations

  1. Confluent Medical Technologies Inc., Fremont, CA, USA

    Ali Shamimi & Tom Duerig

  2. Colorado School of Mines, Golden, CO, USA

    Behnam Amin-Ahmadi & Aaron Stebner

Authors
  1. Ali Shamimi
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  2. Behnam Amin-Ahmadi
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  3. Aaron Stebner
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  4. Tom Duerig
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Correspondence to Ali Shamimi.

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Shamimi, A., Amin-Ahmadi, B., Stebner, A. et al. The Effect of Low Temperature Aging and the Evolution of R-Phase in Ni-Rich NiTi. Shap. Mem. Superelasticity 4, 417–427 (2018). https://doi.org/10.1007/s40830-018-0193-9

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  • DOI: https://doi.org/10.1007/s40830-018-0193-9

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