Slipband

Slipband, or slip band, is a narrow region of localized plastic deformation in crystalline solids produced by the glide of dislocations on specific crystallographic slip planes. During plastic deformation, dislocations move en masse along favorable slip systems, concentrating strain into a slender band. In many metals, this localization appears on the surface as parallel lines and becomes visible after polishing and etching, or under optical or electron microscopy as a high-density zone of dislocations.

The orientation of slip bands follows the active slip system of the crystal (for example, in face-centered cubic metals, along {111} planes in the <110> directions). They commonly form during cold working, tensile loading, bending, or fatigue, and their appearance depends on temperature, strain rate, and grain orientation. Within the band, the density of dislocations is higher and the local hardness can be altered.

Slip bands are distinct from shear bands, which occur in amorphous materials and are broader regions of intense shear. Slip bands indicate localized crystalline plastic flow and can act as precursors to crack initiation under subsequent loading, especially at grain boundaries or near obstacles. Their study informs understanding of work hardening, ductility, and fatigue behavior.