The evolution in the grain boundary fraction (Fig. 4 (a)) seems to be very interesting in this case. There is significant difference in the GB fraction after two different processing techniques. The monotonically (CW) deformed samples have higher amount of HAGBs as compared to the strain reversed (CW-CCW) deformed samples. The reason behind this could be Frank-Reed (F-R) Source of dislocation, in which is based on the dislocation multiplication in a slip place under shear stress [18]. During first clockwise rotation, the dislocations are generated and then during the proceeding counter-clockwise (strain reverse) rotation, another set of dislocation generated move in the opposite direction of the dislocations generated in the clockwise rotation. Due to this, there is a back stress and the dislocation sources are pinned down which during further rotations leads to less dislocation generation. Ultimately, due to less dislocation generation, at higher strains, there is less fraction of HAGBs in strain reversed (CW-CCW) deformation as compared to monotonous deformation (CW) deformation as schematically shown in Fig. 7.