Non-Amontons frictional behaviors of grain boundaries at layered material interfaces
Yiming Song, Xiang Gao, Rémy Pawlak, Shuyu Huang, Antoine Hinaut, Thilo Glatzel, Oded Hod, Michael Urbakh, Ernst Meyer
Abstract
Against conventional wisdom, corrugated grain boundaries in polycrystalline graphene, grown on Pt(111) surfaces, are shown to exhibit negative friction coefficients and non-monotonic velocity dependence. Using combined experimental, simulation, and modeling efforts, the underlying energy dissipation mechanism is found to be dominated by dynamic buckling of grain boundary dislocation protrusions. The revealed mechanism is expected to appear in a wide range of polycrystalline two-dimensional material interfaces, thus supporting the design of large-scale dry superlubric contacts.
Topics & Concepts
Grain boundaryMaterials scienceNanotechnologyComposite materialMicrostructureForce Microscopy Techniques and ApplicationsMicrostructure and mechanical propertiesMetal and Thin Film Mechanics