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Interfacial anti-fatigue effect in graphene-copper nanolayered composites under cyclic shear loading
Xiaoyi Liu1, Jin Cai, Sheng-Nian Luo
1The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China. sluo@pims.ac.cn.
Physical Chemistry Chemical Physics : PCCP
|March 7, 2018
Summary
Graphene-copper nanolayered composites exhibit significantly enhanced fatigue strength, up to 400% higher than pure copper. This anti-fatigue effect is achieved by graphene interfaces trapping dislocations, with optimal performance at 3-7 nm layer spacing.
Area of Science:
- Materials Science
- Mechanical Engineering
- Nanotechnology
Background:
- Low-cycle fatigue is a critical failure mechanism in metallic materials.
- Graphene-copper nanolayered (GCuNL) composites offer potential for improved mechanical properties.
- Understanding fatigue behavior in nanostructured materials is essential for advanced applications.
Purpose of the Study:
- To investigate the low-cycle fatigue behaviors of GCuNL composites.
- To analyze the influence of interface configurations and repeat layer spacing on fatigue performance.
- To determine the optimal conditions for enhanced anti-fatigue properties.
Main Methods:
- Experimental exploration of GCuNL composites under cyclic loading.
- Analysis of dislocation behavior at graphene-copper interfaces.
- Systematic variation of repeat layer spacing (3-7 nm) and interface configurations.
Main Results:
- GCuNL composites showed up to 400% increase in fatigue strength compared to pure copper.
- Graphene interfaces effectively trapped dislocations, preventing softening and enhancing fatigue resistance.
- The anti-fatigue effect was independent of copper crystal orientation or graphene chirality.
- Repeat layer spacing critically influenced composite instability, nonlinearity, and anti-fatigue capability.
Conclusions:
- Graphene interfaces provide significant anti-fatigue benefits in copper composites.
- Tailoring repeat layer spacing is crucial for optimizing fatigue performance and interface stability.
- An optimum repeat layer spacing of 3-7 nm balances anti-fatigue capability and structural integrity.
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