The mesh-length/LEDS theory was extended so as to include the role of so-called non-redundant dislocations, where only so-called glide dislocations and filler dislocations had previously been considered. It was suggested that the non-redundant dislocations, which were due to incidental stress gradients, provided the so-called incidental cell walls which controlled the flow stress. On the other hand, the boundaries which delineated cell blocks, and had previously been termed geometrically necessary boundaries, comprised mutually trapped glide dislocations plus filler dislocations and could contribute to work hardening. These conclusions were supported by the fact that the theoretically derived rotation angles that were associated with ordinary cell walls were in surprisingly good agreement with available measurements.

Dislocation Cells, Redundant Dislocations and the Low-Energy Dislocation Structure Hypothesis. D.Kuhlmann-Wilsdorf: Scripta Materialia, 1996, 34[4], 641-50