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Later work found no such cavities, and whether glass is ductile at the nanometer scale is disputed.","posed_since":"2003","precise":"For slow stress-corrosion cracks in silica and aluminosilicate glasses, determine whether crack advance involves a plastic process zone with nanocavities of size about 1e-6 cm ahead of the tip, or atom-by-atom bond rupture with a process zone of a few bond lengths. An answer gives the process-zone size and the fraction of fracture energy dissipated plastically, from in situ imaging or matched fracture-surface analysis and simulations with reliable silica potentials.","problem_ref":null,"references":"","settled_by":"In situ, nanometer-resolution imaging of a propagating crack tip in silica, or matched-surface topography with sub-nanometer resolution, consistent with large-scale atomistic simulations.","status_note":"Nanocavities reported by atomic force microscopy in 2003 (Celarie et al., Phys. Rev. Lett., https://doi.org/10.1103/PhysRevLett.90.075504) were not found by matched fracture-surface analysis in 2004 (Guin and Wiederhorn, https://doi.org/10.1103/PhysRevLett.92.215502).","title":"Is fracture of oxide glasses ductile at the nanometer 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