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Very High Cycle Fatigue of Wrought NiTi Shape Memory Alloys

Pete Angelo Rocco, Alireza Behvar

2026enni-tishape memoryfatiguealloyssuperelastic

Abstract

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Very-high-cycle fatigue (VHCF) data for superelastic NiTi beyond 107 cycles remain limited, particularly for wrought, precipitate-tuned conditions tested under ultrasonic loading. This study aims to provide insights into the VHCF response of a Ni-rich wrought NiTi alloy, specifically investigating how precipitation-tuned transformation behavior and inclusion populations affect crack initiation under very high cycle fatigue conditions. A systematic methodology entailing ultrasonic fatigue testing was employed to evaluate the material's performance over extensive cycle ranges. Results indicated that specific microstructural features, including the size and distribution of non-metallic inclusions, significantly contribute to the fatigue life of the alloy, with optimized precipitation conditions enhancing its resistance to crack initiation and propagation. These findings underscore the critical influence of thermomechanical processing on the VHCF properties of NiTi shape memory alloys and present valuable data for furthering applications in biomedical and actuator devices requiring high reliability under cyclic loading conditions.

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Cite This Work

@article{a3b5cc3e-4717-4e62-b11b-92fca12d4bad,
  title={Very High Cycle Fatigue of Wrought NiTi Shape Memory Alloys},
  author={Pete Angelo Rocco and Alireza Behvar},
  year={2026},
  language={en}
}
TY  - JOUR
TI  - Very High Cycle Fatigue of Wrought NiTi Shape Memory Alloys
AU  - Pete Angelo Rocco
AU  - Alireza Behvar
PY  - 2026
LA  - en
ER  -

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