Fig. 3.

Successive snapshots of reverse motion of partial dislocations inside a large gain in the d = 20 nm sample at 300 K. (A) At 0.50 ns, partial dislocations are nucleated from GBs. (B) At 0.96 ns, partial dislocations glide through the grain, leaving behind some stacking faults. Dislocations “4” and “5” interact by emission of partials at the neighboring slip plane, generating a dislocation ‘4′“ and a twin boundary, and twin boundary hinders the further motion of dislocation ”1.“ (C) At 1.78 ns, dislocations ”1“ and ”4′“ move in reverse, while partial ”3“ disappears after complete retraction. (D) At 1.86 ns, partials ”2“ and ”4′“ moves backwards, and partial ”1“ completely disappears. (Scale bar, 5 nm.)