Strengthening effect due to quasiperiodic grain boundaries in crystals

被引：0
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作者：
Gutkin, M.Yu. [1 ]
Ovid'ko, I.A. [1 ]
机构：
[1] Russian Acad of Sciences, St. Petersburg, Russia
来源：
Materials Science Forum | 1996年 / 207-209卷 / pt 1期
关键词：
Calculations - Crystal defects - Crystal lattices - Dislocations (crystals) - Grain boundaries - Mathematical models - Plastic deformation - Polycrystalline materials - Stresses;
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摘要：
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 at 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.
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页码：321 / 324
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