Editing Dislocation (section)

==== Geometrically necessary dislocations ====
{{main article|Geometrically necessary dislocations}}

Geometrically necessary dislocations are arrangements of dislocations that can accommodate a limited degree of plastic bending in a crystalline material.
Tangles of dislocations are found at the early stage of deformation and appear as non well-defined boundaries; the process of dynamic [[recovery (metallurgy)|recovery]] leads eventually to the formation of a cellular structure containing boundaries with misorientation lower than 15° (low angle grain boundaries).