Abstract
AbstractThe character of collective motion of the point defects and dislocations of various types determines the mode of plastic deformation and of fracture as its final stage. The concepts of the translational and rotational modes appeared at an early stage in the study of the mechanisms of plastic deformation in crystals and have undergone substantial evolution in connection with the development of methods for the direct observation of lattice defects. As a rule, different modes, e.g. diffusion and dislocation plasticity, translations and rotations, slip and twinning, plasticity and fracture, etc. are interrelated. The conditions for the loss of stability in plastic deformation and fracture are discussed. The rotational modes of plastic deformation are shown to be a consequence of the translational ones. The disclination modes are demonstrated to result from a simplified description of the dislocation kinetics.
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