Fig. 2: Transition from transmission to absorption of screw dislocations.

Snapshots from the Supplementary movie 1 of cycle 2, showing the dynamic of SAS1 a just before activation, and b–d at different times during deformation. The yellow (resp. white) arrows indicate the freshly formed ST in grain A (resp. grain B). Red segments in b are used to indicate the connection between STs in both grains (see also the schematic in e). Note that the Burgers vector of the dislocation of the SAS is parallel to the intersection between the gliding plane of the dislocation and the CTB plane. Red arrows show the formation of fringe-like contrast at the CTB indicating the absorption of the incoming dislocations at the CTB (see the schematic in f). The white dot shows the location of the TB ledge used as a reference.