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<p>This study investigates the thermomechanical and elastocaloric behavior of a nickel-titanium (NiTi) shape memory alloy (SMA) wire subjected to fast cyclic loading at ambient temperature. Infrared thermography (IRT) and heat source reconstruction (HSR) were employed to analyze the first twenty mechanical cycles applied to a virgin specimen, capturing the material’s dynamic calorific response during superelastic deformation. Significant temperature variations, up to about 42&#xa0;K initially and reducing to 30&#xa0;K after mechanical stabilization, emphasize the promising elastocaloric potential of NiTi for cooling applications. Early cycles showed martensitic transformation (MT) with localized heat release in few shear bands propagating through the specimen. As cycling progressed, MT became patterned with multiple nucleation and merging events. For all cycles, homogeneous MT outside the stress plateaus was evidenced at the scale of the observation. The difference between the first and subsequent cycles indicates microstructural modifications that provide stable and homogeneous thermomechanical properties of the material, which is advantageous from an application design point of view. The combined use of IRT and HSR proves effective for rapid characterization of functional fatigue and elastocaloric performance of NiTi alloys, offering insights into their suitability for efficient cooling technologies.</p>

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Fast Characterization of the Functional Fatigue of NiTi by Infrared Thermography and Heat Source Reconstruction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月6日

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  • A. Jury,
  • X. Balandraud,
  • L. Heller

摘要

This study investigates the thermomechanical and elastocaloric behavior of a nickel-titanium (NiTi) shape memory alloy (SMA) wire subjected to fast cyclic loading at ambient temperature. Infrared thermography (IRT) and heat source reconstruction (HSR) were employed to analyze the first twenty mechanical cycles applied to a virgin specimen, capturing the material’s dynamic calorific response during superelastic deformation. Significant temperature variations, up to about 42 K initially and reducing to 30 K after mechanical stabilization, emphasize the promising elastocaloric potential of NiTi for cooling applications. Early cycles showed martensitic transformation (MT) with localized heat release in few shear bands propagating through the specimen. As cycling progressed, MT became patterned with multiple nucleation and merging events. For all cycles, homogeneous MT outside the stress plateaus was evidenced at the scale of the observation. The difference between the first and subsequent cycles indicates microstructural modifications that provide stable and homogeneous thermomechanical properties of the material, which is advantageous from an application design point of view. The combined use of IRT and HSR proves effective for rapid characterization of functional fatigue and elastocaloric performance of NiTi alloys, offering insights into their suitability for efficient cooling technologies.