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Very High Cycle Fatigue of Wrought NiTi Shape Memory Alloys

Pete Angelo Rocco, Alireza Behvar

2026enfatigueshape memoryNiTisuperelasticalloys

Abstract

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This study investigates the very high cycle fatigue (VHCF) behavior of wrought NiTi shape memory alloys, particularly under ultrasonic loading, which has been understudied beyond 10^7 cycles. The objective is to elucidate the influence of precipitation-tuned transformation behavior and the presence of inclusions on VHCF crack initiation. Methodologically, the VHCF response of a Ni-rich wrought NiTi (Ni50.8Ti4) was evaluated through a series of ultrasonic fatigue tests, focusing on the microstructural characteristics and their role in fatigue performance. Results revealed that specific inclusion populations significantly affect the initiation of fatigue cracks, while the material’s precipitation state alters its transformation behavior during cycling. This research contributes to the understanding of superelastic NiTi’s fatigue behavior under extreme cycling conditions and suggests pathways for optimizing its performance in biomedical applications and other engineering scenarios.

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Cite This Work

@article{49529694-a6f3-45e1-9c40-d985819452b9,
  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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