梯度纳米晶增强NiTi合金悬臂梁弯曲疲劳寿命

doi:10.11896/cldb.24110203

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Abstract Bending is one of the most widely used loading modes of NiTi alloys in application fields. However, the poor cyclic stability and low fatigue life under large deformation bending conditions greatly limit its application range. In this work, NiTi plates with different grain size-gradient distributions through nanotechnology were fabricated. Multi-field synchronous bending experiments of cantilever beams were conducted at two deflection amplitudes. The influence mechanism of grain size-gradient on bending fatigue life was discussed through analysis on microstructure and stress of different layers. The results demonstrate that the bending fatigue life greatly increases by the nanoscaled grain size-gradient along the thickness direction, reaching over 2 million cycles at a 2 mm deflection—more than 20 times longer than other types (the highest value reported to date). The axial residual compressive stress of high-distortion nanocrystallites reduces the tensile stress of the upper surface as loading, lowe-ring the local strain gradient of martensitic transformation. The nanoscale arrangement of dislocation barriers at the surface impedes the interactive aggregation of the phase transition-activated dislocations and retaines plastic bands towards the surface layer, reducing the nucleation ratio of defects and microcracks. This gradient nanocrystallites has achieved significant advancements in enhancing the bending fatigue life of NiTi alloy, presenting a feasible case for broadening the application range of NiTi alloy under bending loads.

Key words： NiTi alloy gradient nanocrystallites bending fatigue life residual stress dislocation

Published: 25 December 2025 Online: 2025-12-17

CLC number:

TB381

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	HUANG Kai
	DENG Zhongzheng
	YIN Hao

Cite this article:

HUANG Kai,DENG Zhongzheng,YIN Hao. Enhancing Bending Fatigue Life of NiTi Alloy Cantilever Beam via Gradient Nanocrystallites[J]. Materials Reports, 2025, 39(24): 24110203-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24110203 OR https://www.mater-rep.com/EN/Y2025/V39/I24/24110203

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