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<p>The optimization of heat treatment parameters is critical for enhancing the reliability and durability of TiNi wire in medical applications. This study investigates the mechanical properties, microstructure, and phase composition of TiNi wire subjected to annealing at 500&#xa0;°C using synchrotron radiation and electron microscopy. Annealing induces a multiphase structure comprising the B2(TiNi) matrix phase, non-stoichiometric titanium oxide nanoparticles (TiOx), Ni(Ti) solid solutions, and submicrocrystalline Ti4Ni2O and TiNi3 precipitates. These structural changes degrade the wire’s tensile strength (by a factor of 2.5) and critical martensitic shear stress (from 513 to 166&#xa0;MPa), thereby suppressing its superelasticity.</p>

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Study of the effect of high temperature annealing on the phase composition, martensitic transformations and mechanical properties of thin TiNi wire using synchrotron X-ray diffraction

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • E. S. Marchenko,
  • M. A. Kovaleva,
  • G. A. Baigonakova,
  • V. O. Semin,
  • M. G. Ostapenko,
  • S. V. Vladimirov,
  • V. P. Borodin

摘要

The optimization of heat treatment parameters is critical for enhancing the reliability and durability of TiNi wire in medical applications. This study investigates the mechanical properties, microstructure, and phase composition of TiNi wire subjected to annealing at 500 °C using synchrotron radiation and electron microscopy. Annealing induces a multiphase structure comprising the B2(TiNi) matrix phase, non-stoichiometric titanium oxide nanoparticles (TiOx), Ni(Ti) solid solutions, and submicrocrystalline Ti4Ni2O and TiNi3 precipitates. These structural changes degrade the wire’s tensile strength (by a factor of 2.5) and critical martensitic shear stress (from 513 to 166 MPa), thereby suppressing its superelasticity.