Figure 5 | Scientific Reports

Figure 5

From: A correlation between grain boundary character and deformation twin nucleation mechanism in coarse-grained high-Mn austenitic steel

Figure 5

Selected frames of an in-situ deformation TEM test video (see Supplementary Video S2 online) showing near a Σ73 boundary region where the continuous stacking fault emission occurred. The images were recorded in a two-beam condition for g = \({200}\). (a) An intrinsic stacking fault having the dark outer fringe. (b,c) A leading partial dislocation emitted from the grain boundary gliding away on an adjacent slip plane, indicated by striped arrow. It results in two stacking faults overlapped (reversal fringe contrast, i.e., white outer fringe). (d,e) The third leading partial dislocation emitted from the grain boundary into the adjacent fault plane (indicated by the striped arrows) caused a three-layer deformation twin being out of contrast. (f) A near grain boundary region of the adjacent grain shows no dislocation pile-ups. A faint contrast induced by the grain boundary itself was visible.

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