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<p>The present study covers the main kinds of virgin structures obtained as a result of thermomechanical processing traditionally used in practice − from a mixed hot drawing-induced&#xa0;structure to a coarse-grained one. A virgin structure essentially affects the transformation and mechanical behavior of Ni<sub>50.8</sub>Ti alloy subjected to aging. Specific features of a virgin structure predetermine the difference in evolution of temperature ranges of martensitic transformations, thermal hysteresis, and the latent heat with an increase in aging temperature; these characteristics show a non-monotonous dependence. Virgin materials, as well as after aging at 300&#xa0;°C, show an agreement with the Hall–Petch, but it is not valid after aging at 430–500&#xa0;°C. The effect of a virgin structure on the mechanical behavior of a material exhibits an ambiguous character under aging development: A coarse-grained and as-deformed material shows the most significant improvement of the studied characteristics, while a fine-grained material shows the mildest response. An explanation of this phenomenon is proposed. The revealed findings open new possibilities for precise forecasting of the transformation and mechanical behavior of Ni-rich NiTi alloy.</p>

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Comparative Studies of Stress-Temperature Behavior and Aging Efficiency of Ni50.8Ti Alloy with Various Virgin Structures

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • K. Polyakova,
  • E. Ryklina,
  • V. Komarov,
  • V. Andreev

摘要

The present study covers the main kinds of virgin structures obtained as a result of thermomechanical processing traditionally used in practice − from a mixed hot drawing-induced structure to a coarse-grained one. A virgin structure essentially affects the transformation and mechanical behavior of Ni50.8Ti alloy subjected to aging. Specific features of a virgin structure predetermine the difference in evolution of temperature ranges of martensitic transformations, thermal hysteresis, and the latent heat with an increase in aging temperature; these characteristics show a non-monotonous dependence. Virgin materials, as well as after aging at 300 °C, show an agreement with the Hall–Petch, but it is not valid after aging at 430–500 °C. The effect of a virgin structure on the mechanical behavior of a material exhibits an ambiguous character under aging development: A coarse-grained and as-deformed material shows the most significant improvement of the studied characteristics, while a fine-grained material shows the mildest response. An explanation of this phenomenon is proposed. The revealed findings open new possibilities for precise forecasting of the transformation and mechanical behavior of Ni-rich NiTi alloy.