Figure 4: The sketch for the dislocation motion and the crack formation along the slip band and the TB.
From: Controllable fatigue cracking mechanisms of copper bicrystals with a coherent twin boundary
(a) Dislocation cross-slip in the slip bands (SBs) in the grain interior. (b) The vacancies aggregate in the SBs to form the SB crack. (c) The dislocations from the two component grains transfer to the TB by cross-slip. (d) The vacancies aggregate on the TB to form the TB crack.
