Faceting–roughening of twin grain boundaries |
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Authors: | B B Straumal B Baretzky O A Kogtenkova A S Gornakova V G Sursaeva |
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Affiliation: | 1.Institute of Solid State Physics,Russian Academy of Sciences,Chernogolovka,Russia;2.Karlsruher Institut für Technologie,Institut für Nanotechnologie,Eggenstein-Leopoldshafen,Germany |
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Abstract: | The coincidence site lattice (CSL) plays a similar role for grain boundaries (GB) as the crystal lattice plays for free surfaces.
The most densely packed CSL is the twin-related CSL, characterized by an inverse density of coincidence sites Σ = 3. Phase
diagrams in coordinates “relative temperature T/T
m—misorientation angle θ—inclination angle φ” were constructed for the twin GBs in Cu, Al, and Mo having different stacking
fault energy γ. At low γ the twin GB remains faceted at all φ values and the number of crystallographically different facets
increases with decreasing temperature. With increasing γ asymmetric twin GBs become more and more rough, and fewer facets
appear with decreasing temperature. Also, with increasing γ the facets start to degenerate of into the first order rough-to-rough
ridges. The behavior of twin GBs in Cu, Al, and Mo is compared with that of twin GBs in Zn. |
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