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<p>This study aims analyzing the grain-scale mechanical behavior of a High Entropy Shape Memory Alloy (HESMA) using synchrotron-based diffraction techniques. The alloy <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mathrm {Ti_{30}Hf_{19}Zr_{25}Nb_{13}Ta_{13}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="normal">Ti</mi> <mn>30</mn> </msub> <msub> <mi mathvariant="normal">Hf</mi> <mn>19</mn> </msub> <msub> <mi mathvariant="normal">Zr</mi> <mn>25</mn> </msub> <msub> <mi mathvariant="normal">Nb</mi> <mn>13</mn> </msub> <msub> <mi mathvariant="normal">Ta</mi> <mn>13</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> was subjected to in-situ tensile tests at ambient temperature and grain-resolved data were acquired using Diffraction Contrast Tomography (DCT) and Three-Dimensional X-ray Diffraction (3DXRD), enabling simultaneous mapping of grain morphology, orientation, and elastic strain tensors. Both techniques showed consistent strain measurements, with 3DXRD exhibiting lower dispersions in the inelastic regime. Indexed grain number decreased with increasing load, indicating high lattice strains and/or a phase transformation. Partial recovery during unloading suggested reversible martensitic transformation. An inverse method was used to extract intrinsic single-crystal elastic constants via a least-squares fitting, showing correlation with valence electron concentration, consistent with <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\beta \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>β</mi> </math></EquationSource> </InlineEquation>-Ti alloy trends. Combined with DCT and 3DXRD, a digital twin of the microstructure with local grain properties is therefore enabled.</p>

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Deformation Mechanisms of a TiHfZrNbTa High Entropy Superelastic Alloy by In Situ Synchrotron Based DCT and 3DXRD Techniques

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月9日

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  • Léo Thiercelin,
  • Xavier Morel,
  • Laurent Peltier,
  • Charles Romain,
  • Denis Bouscaud,
  • Wolfgang Ludwig,
  • Jon Wright,
  • Wafa Elmay,
  • Benoit Malard,
  • Sophie Berveiller

摘要

This study aims analyzing the grain-scale mechanical behavior of a High Entropy Shape Memory Alloy (HESMA) using synchrotron-based diffraction techniques. The alloy \(\mathrm {Ti_{30}Hf_{19}Zr_{25}Nb_{13}Ta_{13}}\) Ti 30 Hf 19 Zr 25 Nb 13 Ta 13 was subjected to in-situ tensile tests at ambient temperature and grain-resolved data were acquired using Diffraction Contrast Tomography (DCT) and Three-Dimensional X-ray Diffraction (3DXRD), enabling simultaneous mapping of grain morphology, orientation, and elastic strain tensors. Both techniques showed consistent strain measurements, with 3DXRD exhibiting lower dispersions in the inelastic regime. Indexed grain number decreased with increasing load, indicating high lattice strains and/or a phase transformation. Partial recovery during unloading suggested reversible martensitic transformation. An inverse method was used to extract intrinsic single-crystal elastic constants via a least-squares fitting, showing correlation with valence electron concentration, consistent with \(\beta \) β -Ti alloy trends. Combined with DCT and 3DXRD, a digital twin of the microstructure with local grain properties is therefore enabled.