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The effect of graphene flakes on the strength of Ni-graphene composites isinvestigated using molecular dynamics simulation. Rather than introducingflakes as flat structures into the Ni matrix, as it is common in availablestudies, we introduce them into the heated liquid Ni and let the structuresequilibrate in a 14-ns molecular-dynamics run; these structures are thenquenched to obtain the composites. By varying the interaction of flake edgeatoms with the Ni matrix, two different flake morphologies -- wrinkled vs flat-- are obtained. The mechanical properties, and in particular the compositehardness, are investigated by a simulated nanoindentation test. The flakemorphology affects the plastic activity and the hardness of the composites.Wrinkled flakes show a higher potential in absorbing dislocations than flatflakes, resulting in a considerably reduced hardness of the composite. Noeffect of the changed interaction between graphene edge atoms and the Ni matrixon the dislocation activity and hardness could be observed. Furthermore, wedemonstrate that a high graphene content in the plastic zone leads to anincreased dislocation absorption and weakens the composite.

Morphology of graphene flakes in Ni-graphene nanocomposites and its influence on hardness: an atomistic study