Orientation-Dependent Tensile Behavior of Nanolaminated Graphene-Al Composites: An In Situ Study
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We conducted in situ microtension experiments in a scanning electron microscope (SEM) to study the orientation-dependent mechanical behavior of nanolaminated graphene-Al composite. We found a transition from a weak-and-brittle behavior in the isostress composite configuration to a strong-yet-ductile tensile response in the composite under isostrain condition. This is explained by the excellent load-bearing capacity of the graphene nanosheets and a crack deflection mechanism rendered by the laminate structure. These in situ measurements enabled direct observation of the deformation procedure and the exact failure mode, which highlight the importance of microstructural control in tailoring the mechanical properties of advanced metal matrix composites (MMCs).
This work was supported by the Ministry of Science and Technology of China through the National Key R & D Plan (Grant Nos. 2017YFB0703103 and 2016YFE0130200), the Natural Science Foundation of China (Grant Nos. 51771111, 51671130, and 51771110), and the Science & Technology Committee of Shanghai Municipality (Grant No. 17520712400). The authors thank Dr. Warren Oliver, Dr. Yujie Meng, and Sam Bacon, Nanomechanics Inc., for their assistance with the implementation of in situ nanoindentation.
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