Abstract
Theoretical model is suggested, which describes of a new micromechanism of crossover from deformation twinning to lattice dislocation slip in metal–graphene nanocomposite with a bimodal structure. In the framework of the model, the lattice dislocation slip occurs through emission of lattice dislocations from the disclinated grain boundary fragments between a nanocrystalline metal–matrix and large (micrometer-size) grains providing the plastic deformation of bimodal metal–graphene nanocomposite. It is shown that the lattice dislocation emission serves as an effective stress relaxation channel being in competition with nanocrack generation.
Highlights
IntroductionTransport and thermal properties [1,2,3]. These unique mechanical characteristics of graphene determine a great potential in the use of graphene inclusions (sheets, nanoplatelets) in composites with polymer, ceramic and metal matrix [4,5,6,7,8]
Graphene demonstrates unique mechanical, transport and thermal properties [1,2,3]
The theoretical model of the new micromechanism of the crossover from the deformation twinning to the lattice dislocation slip in the bimodal metal–graphene nanocomposites was developed
Summary
Transport and thermal properties [1,2,3]. These unique mechanical characteristics of graphene determine a great potential in the use of graphene inclusions (sheets, nanoplatelets) in composites with polymer, ceramic and metal matrix [4,5,6,7,8]. In recent years, researchers have obtained metal–matrix nanocomposites reinforced by graphene inclusions [4,5,6,7,8]. Such nanocomposites exhibit enhanced mechanical characteristics, as compared to unreinforced metals. Graphene inclusions act as effective obstacles for realizing grain boundary migration and deformation twinning in metal–graphene composites with a nanocrystalline and ultrafine-grained matrix. These mechanisms are the dominant modes of the plastic deformation in the nanocomposites. The experiments [5,6] on measuring the microhardness and elongation to failure of the copper-graphene composite show an increase in microhardness by 39% and a decrease in elongation to failure by more than three times, as compared to pure copper
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