Figure 2

Selected frames of an in-situ deforming TEM test video data (see the original video, Supplementary Video S1 online) showing a near annealing twin boundary region. The video was recorded in the two-beam condition for g = \({111}\). (a) The initial stage of stacking faults emission event. (b–e) A continuous emission of stacking faults from the Σ3{111} boundary. The periodic contrast change was observed during the deformation. (f) The adjacent grain shows piled-up dislocations impinged on the Σ3{111} boundary and a local stress concentration field near grain boundary region. (g) A magnified view shows another stacking fault nucleated from a different Σ3{111} boundary taken in the two-beam condition for g = \({020}\), near a \({[{10}\bar{2}]}_{\mathrm{fcc}}\) zone axis. The fringe contrast changes were indicated by the arrows filled with dots (F₁, F₂, F₃).