Abstract
The kinetics of dislocations is studied by means of computer simulation at different severe loadings. It is found that the dislocations can have a few (at least, two) different structural states. The localized dislocations with core shape as micropore play important role in formation of large curved grain boundaries, and, as a consequence, in formation of fine grains. Saltatory alternation of elastic and non-elastic stages of deformation is revealed too. At shear loading in view of special kinetics the system would have to accumulate whole set of localized dislocations leading to formation of new boundaries and fine grains.
Highlights
The greatest progress of modern technologies is connected with production of nanomaterials
Others try to explain their formation from positions of dislocation dynamics into bulk of grains [6,7,8,9,10,11]
The dislocation dynamics in 2D systems under different deformation loading has been the subject of a large number of theoretical investigations [19,20,21,22,23]
Summary
The greatest progress of modern technologies is connected with production of nanomaterials. The dislocation dynamics in 2D systems under different deformation loading has been the subject of a large number of theoretical investigations [19,20,21,22,23] Such researches do not put by the purpose to exact modeling of any particular materials, and only task to understand qualitative features of dislocation behavior at an atomic level. They once enter in reaction again, restoring orientation of sliding planes to parallel boundary Such simple and beautiful reaction has appeared possible owing to a successful choice of initial conditions of problem - dislocations in pair are separated on necessary distance, pressure of lattice mismatch has appeared enough for initiation of these reactions etc. The same picture is present during formation of nanostructures with friction under pressure [26]
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