Abstract
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 = 1356 K). 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 0.95 T m. With decreasing temperature new facets of increasingly higher CSL indices appear. At 0.5 T 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.
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