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- W3110937176 abstract "The formation, propagation, and structure of nanoscale cracks determine the failure mechanics of engineered materials. Herein, we have captured, with atomic resolution and in real time, unit cell-by-unit cell lattice-trapped cracking in two-dimensional (2D) rhenium disulfide (ReS2) using in situ aberration corrected scanning transmission electron microscopy (STEM). Our real time observations of atomic configurations and corresponding strain fields in propagating cracks directly reveal the atomistic fracture mechanisms. The entirely brittle fracture with non-blunted crack tips as well as perfect healing of cracks have been observed. The mode I fracture toughness of 2D ReS2 is measured. Our experiments have bridged the linear elastic deformation zone and the ultimate nm-sized nonlinear deformation zone inside the crack tip. The dynamics of fracture has been explained by the atomic lattice trapping model. The direct visualization on the strain field in the ongoing crack tips and the gained insights of discrete bond breaking or healing in cracks will facilitate deeper insights into how atoms are able to withstand exceptionally large strains at the crack tips.Received 16 June 2020Revised 10 September 2020Accepted 16 October 2020DOI:https://doi.org/10.1103/PhysRevLett.125.246102Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFractureTechniquesScanning transmission electron microscopyTransmission electron microscopyCondensed Matter & Materials Physics" @default.
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- W3110937176 date "2020-12-09" @default.
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- W3110937176 title "<i>In Situ</i> Scanning Transmission Electron Microscopy Observations of Fracture at the Atomic Scale" @default.
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- W3110937176 doi "https://doi.org/10.1103/physrevlett.125.246102" @default.
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