Graphene-coated Ni: mechanical properties

The search for new protective coatings for metal surfaces is one of the most important issues nowadays. From this point of view, carbon nanostructures are very attractive due to their unique mechanical and physical properties. In the present work, the mechanical properties of Ni surface coated with monolayer and multilayer graphene under tension were investigated by molecular dynamics simulation. The structural changes in the Ni surface during tensile loading were analyzed in detail. It was found that for Ni, which strongly interacts with graphene, dislocation nucleation occurred at the interface between Ni and graphene, not on a free surface. It was observed that even one graphene layer can increase the ultimate tensile strength of Ni by three times. For multilayer graphene coating, wrinkling of graphene layers was observed except for the first graphene layer. The first graphene layer strongly adheres to Ni and repeat the deformation relief. It was found that an increase in the number of graphene layers in the coating leads to an enhancement of the ultimate tensile strength and Young’s modulus, while the fracture strain was almost unaffected. The results obtained show great perspectives for the application of graphene as a coating for metals such as Ni, having high adsorption energy with graphene.

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1. Russian Science Foundation - 20-72-10112-Π
2. State Assignement of IMSP RAS (Young Scientist Laboratory) -
3. Grant of the Bashkortostan Republic of the Russian Federation for young scientists -