Abstract
The interrelationship between the geometrical and plastic characteristics of quasiperiodic grain boundaries in crystals is investigated. The method of density waves is used to obtain a theoretical description of the translational and phason (associated with relative displacements of adjacent crystal grains) degrees of freedom of a quasiperiodic boundary. The role of quasiperiodic grain boundaries in intergranular slip processes is analyzed. Quasinanocrystalline solids (nanostructured polycrystals with quasiperiodic grain boundaries) are defined as a new type of nanostructured materials with deformation characteristics attributable to the plastic properties of the quasiperiodic grain boundaries.
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