Abstract This study aims analyzing the grain-scale mechanical behavior of a High Entropy Shape Memory Alloy (HESMA) using synchrotron-based diffraction techniques. The alloy Ti₃₀Hf₁₉Zr₂₅Nb₁₃Ta₁₃ 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 β -Ti alloy trends. Combined with DCT and 3DXRD, a digital twin of the microstructure with local grain properties is therefore enabled.
Thiercelin et al. (Thu,) studied this question.
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