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The faceting of a tube-like tilt grain boundary (GB) in Cu bicrystals has been studied in the temperature interval from 0.5 to 0.95 of the melting temperature T m (T m =1356K). The grains of the bicrystals form the coincidence site lattice (CSL) with inverse density of coincidence sites Σ=3 and Σ=9. No rounded edges between facets were observed up to 0.95T m . With decreasing temperature new facets of increasingly higher CSL indices appear. At 0.5T m six crystallographically different Σ=3 facets exist simultaneously. The appearance of high-index CSL facets can be explained by the roughening phase transition of a Kosterlitz–Thouless type. The ratio of GB energy σ GB and surface energy σ sur of the specimen was measured by applying atomic force microscopy to the profile of the GB thermal groove formed upon additional annealing. The Wulff–Herring diagrams were constructed using measured σ GB /σ sur values.
Institute of Solid State Physics, Laboratory of Interfaces in Metals, Russian Academy of Sciences, Institutskii Prospect 15, 142432 Chernogolovka, Moscow District, Russia
Max-Planck-Institut für Metallforschung and Institut für Metallkunde, Heisenbergstr. 3, 70569 Stuttgart, Germany
Institute of Solid State Physics, Laboratory of Interfaces in Metals, Russian Academy of Sciences, Institutskii Prospect 15, 142432 Chernogolovka, Moscow District, Russia