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<p>Deformation behaviour of Ni<sub>50.7</sub>Ti<sub>49.3</sub> SMA at elevated temperature is examined, encompassing mechanical behavior and microstructural evolution. Strain-compensated Arrhenius constitutive model is established derived from flow stresses from compression experiments at 650&#xa0;°C to 950&#xa0;°C and 0.0005 to 0.5&#xa0;s<sup>−1</sup>. Quantitative validation between predicted and experimental values confirms strain-compensated Arrhenius model accurately predicts Ni<sub>50.7</sub>Ti<sub>49.3</sub> SMA flow behavior across all tested conditions. Furthermore, the microstructure evolution of Ni<sub>50.7</sub>Ti<sub>49.3</sub> SMA samples is analyzed and determined that dynamic recovery(DRV) plays a dominant role when the deformation temperatures are 650&#xa0;°C and 750&#xa0;°C, whereas dynamic recrystallization(DRX) recognized as the prominent softening mechanism for Ni<sub>50.7</sub>Ti<sub>49.3</sub> SMA deformed at 850&#xa0;°C and 950&#xa0;°C. In addition, texture analysis reveals strong <i>γ</i>-fiber texture in Ni<sub>50.7</sub>Ti<sub>49.3</sub> SMA under hot compression, where texture intensity scales positively with temperature and inversely with strain rate. Moreover, CDRX is analyzed can obviously improve the intensity of <i>γ</i> fiber texture.</p>

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Hot-Deformation Constitutive Behavior of Ni50.7Ti49.3 Shape Memory Alloy Based on Continuous Dynamic Recrystallization and Discontinuous Dynamic Recrystallization

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Bingyao Yan,
  • Peng Lin,
  • Shuyong Jiang,
  • Dong Sun,
  • Hao Feng,
  • Yanqiu Zhang,
  • Ming Tang

摘要

Deformation behaviour of Ni50.7Ti49.3 SMA at elevated temperature is examined, encompassing mechanical behavior and microstructural evolution. Strain-compensated Arrhenius constitutive model is established derived from flow stresses from compression experiments at 650 °C to 950 °C and 0.0005 to 0.5 s−1. Quantitative validation between predicted and experimental values confirms strain-compensated Arrhenius model accurately predicts Ni50.7Ti49.3 SMA flow behavior across all tested conditions. Furthermore, the microstructure evolution of Ni50.7Ti49.3 SMA samples is analyzed and determined that dynamic recovery(DRV) plays a dominant role when the deformation temperatures are 650 °C and 750 °C, whereas dynamic recrystallization(DRX) recognized as the prominent softening mechanism for Ni50.7Ti49.3 SMA deformed at 850 °C and 950 °C. In addition, texture analysis reveals strong γ-fiber texture in Ni50.7Ti49.3 SMA under hot compression, where texture intensity scales positively with temperature and inversely with strain rate. Moreover, CDRX is analyzed can obviously improve the intensity of γ fiber texture.