ABSTRACT
Extreme effects exert a strong influence on the structure and properties of solids. Undoubtedly, they include the effect of severe plastic deformation. The structural states formed under such gigantic deformation are highly unusual and difficult to predict. The classic dislocation and also disclination approaches to understanding the structural processes under severe plastic deformation appear to be insufficiently effective and require re-examination. The deformation conditions (the type of stress state, temperature, rate, etc.) have a strong effect on the resultant structure and properties of materials. The classic considerations regarding plastic deformation are based on the fact that the increase of the degresevere formation is accompanied by the buildup of dislocations defects. As the plastic strain increases, the number of defects which the deformed crystals should contain increases. The generation of fragments increases the level of non-equilibrium which activates to the same extent proportionately the processes of dynamic recrystallisation, and both processes take place synchronously in time.
