Fig. 3: Generality of the reversible deformation in a variety of metals with different dislocation-type GBs.
From: Metallic nanocrystals with low angle grain boundary for controllable plastic reversibility
a Geometrical model of the LAGB configuration before (left) and after (right) dissociation. The GB misorientation and inclination are indicated by θ and α in the schematic model, respectively. The inset illustrates the GB dissociation into two Shockley partials on the (111) slip plane. b GB dissociation width and corresponding GB energy for different misorientations. Error bars represent the standard deviations from statistical analyses, where n ranges from 6 to 13 for GB dissociation width (depending on the GB misorientation) and n = 3 for GB energy. c Variations in the GB dissociation width with increasing GB misorientation in different face-centred cubic (FCC) metallic bicrystals. The dashed lines mark the upper limits of the misorientation range for stable GB dissociation in different FCC nanocrystals. d Statistics of migration rates and shear coupling factors (β = s/h, illustrated by the inset schematic) of LAGBs with different misorientations. e Ranges of applied shear stresses with respect to the GB misorientation. σmax and σmin denote the shear stresses that induced GB migration towards the bottom and top positions in each cycle, and the interval stress states are differentiated by the gradient colours. f Normalized applied shear stresses (R = |σmax/σmin| , red diamonds) derived from MD simulations, and normalized Schmid factors (γ = mAC,min/mAC,max, blue curve) predicted from the geometrical model. The red dashed line is a linear fitting of the normalized shear stresses.
