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Atomic-scale investigation on mechanical behaviors is highly necessary tofully understand the fracture mechanics especially of brittle materials, whichare determined by atomic-scale phenomena (e.g., lattice trapping). Here,exfoliated anisotropic rhenium disulfide (ReS2) flakes are used to investigateatomic-scale crack propagation depending on the propagation directions. Whilethe conventional strain-stress curves exhibit a strong anisotropy depending onthe cleavage direction of ReS2, but our experimental results show a reducedcleavage anisotropy due to the lattice reconstruction in [100] cracking withhigh resistance to fracture. In other words, [010] and [110] cracks with lowbarriers to cleavage exhibit the ultimate sharpness of the crack tip withoutplastic deformation, whereas [100] cracks drive lattice rotation on one side ofthe crack, leading to a non-flat grain boundary formation. Finally,crystallographic reconstruction associated with the high lattice randomness oftwo-dimensional materials drives to a modified cleavage tendency, furtherindicating the importance of atomic-scale studies for a complete understandingof the mechanics.

Crystallographic Reconstruction Driven Modified Mechanical Properties in Anisotropic Rhenium Disulfides