Catastrophic slip phenomena in crystalline materials

In the work the experimental observations on single and polycrystalline metals are used to show the need for a new approach to crystal plasticity in which three aspects of slip: mechanistic, geometrical and structural are incorporated. A particular attention is paid to the effect of a sequential operation of slip systems. The arguments that the change in the deformation bearing systems leads to the catastrophic coarse slip in single crystals and to shear banding in polycrystalline metals are provided. The model of the sequential multi-system slip is shown along with the results of the numerical calculations of the crystal behavior. The criterion for micro-shear banding is discussed on the basis of the features of micro-shear bands in metallic materials.