Dislocation Configurations in the Process of Microstructure Refinement by Plastic Deformation

摘要

The movement of individual dislocations and their combination in simple dislocation complexes are studied in detail in the classic dislocation theories [1] but the problems of collective dislocation movement and micro-structure development during the intensive plastic deformation have been more scarcely investigated. These problems become especially important nowadays in relation to the new tendencies for manufacturing and utilization of new nanosized materials [2]. The method of Transmission Electron Microscopy (TEM) offers very important information in this field by the visualization of all specific dislocation configurations. This work is an overview of the successive steps of the development and refinement of the deformation structure in metals of different Stacking Fault Energy (SFE), i.e. different dislocations mobility. The theoretical definitions are supported by illustrations obtained in author's laboratory.