Extensive transmission electron microscopy investigations had established that the type of dislocation structure formed in metals of medium-to-high stacking-fault energy, during deformation in tension or during rolling to moderate strain-levels (≤0.8), depended strongly upon the crystallographic grain orientation. Here, the grain orientation-dependent structures were analyzed in terms of the active slip systems; focusing on the crystallographic plane of the extended planar boundaries (geometrically necessary boundaries). This analysis established that slip systems were the factor which controlled the dislocation structure. Five fundamental slip classes, consisting of 1 to 3 active slip systems, were identified. Multiple activation of these slip classes was also considered. The slip classes gave rise to various types of dislocation structure, of which all but one contained geometrically necessary planar boundaries aligned with unique crystallographic planes (and not always slip planes). A slip-class led to the same type of structure, regardless of the macroscopic deformation mode, as was also demonstrated by the successful predictions for shear deformation.

Dislocation Structures II - Slip System Dependence. G.Winther, X.Huang: Philosophical Magazine, 2007, 87[33], 5215-35