Special interaction between quasiperiodic grain boundaries and lattice dislocations in crystalline solids |
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Authors: | MY Gutkin IA Ovid'ko |
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Institution: | (1) Institute of Machine Science Problems, Russian Academy of Sciences, Bolshoj 61, Vas.Ostrov, St.Petersburg 199178, Russia, RU |
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Abstract: | A theoretical model is suggested which describes phason imperfections (specific excitations) in a quasiperiodic grain boundary
in a polycrystalline solid as dilatation flexes. In the framework of the model, an elastic stress field of the quasiperiodic
grain boundary is calculated as a stress field created by an ensemble of dilatation flexes (phason imperfections) located
in the boundary. It is shown that there is a special elastic interaction between crystal lattice defects and quasiperiodic
grain boundaries comprising phason imperfections. The strengthening effect in plastically deformed polycrystalline solids
is quantitatively described which is related to the special elastic interaction between lattice dislocations and quasiperiodic
grain boundaries.
Received: 29 October 1996 / Revised: 22 August 1997 / Accepted: 13 November 1997 |
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Keywords: | PACS 62 20 Fe Deformation and plasticity (including yield ductility and superplasticity) - 68 35 Ct Interface structure and roughness - 68 35 Dv Composition defects and impurities |
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