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Nanomaterials 2019, 9(1), 59;

Graphene Surface Reinforcement of Iron

The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
Authors to whom correspondence should be addressed.
Received: 14 December 2018 / Revised: 24 December 2018 / Accepted: 28 December 2018 / Published: 4 January 2019
(This article belongs to the Special Issue Modeling and Experimental Characterization of Nanocomposite Materials)
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Graphene is an ideal material in the reinforcement of metal-matrix composites owing to its outstanding mechanical and physical properties. Herein, we have investigated the surface enhancement of iron via a computational nanoindentation process using molecular dynamics simulations. The findings of our study show that graphene can enhance the critical yield strength, hardness and elastic modulus of the composite to different degrees with the change of the number of graphene layers. In the six tested models, the composite with trilayer graphene on the surface produces the strongest reinforcement, with an increased magnitude of 432.1% and 169.5% in the hardness and elastic modulus, respectively, compared with pure iron. Furthermore, it is revealed that high temperature could weaken the elastic bearing capacity of the graphene, resulting in a decrease on the elastic mechanical properties of the graphene/Fe composite. View Full-Text
Keywords: nanoindentation; graphene/Fe composite; critical yield strength; hardness; elastic modulus nanoindentation; graphene/Fe composite; critical yield strength; hardness; elastic modulus

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Wang, P.; Cao, Q.; Yan, Y.; Nie, Y.; Liu, S.; Peng, Q. Graphene Surface Reinforcement of Iron. Nanomaterials 2019, 9, 59.

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