![]() (E and F) Emission of an extrinsic SF from a preexisted six-atom-layer kink on the primary TB. ( E to H) MD simulation snapshots elucidating the evolution of TB kink associated with the formation of secondary nanotwin T2. ![]() ( C and D) Nucleation and growth of a secondary nanotwin, which is accompanied by the evolution of faceted TB kink toward a tilt GB segment consisting of C-type structural units. The dashed lines delineate the lattice distortion across the TB kink, and the yellow arrow indicates the motion of a twinning partial along the primary TB. ( A and B) Atomic structure of the TB kink before and after the emission of a partial dislocation (with trailing SF) into T1. ![]() The white dashed line delineates a tilt GB segment (with a misorientation of 45°) transformed from the original TB kink. The light blue arrows indicate the gliding of twinning partials away from the kink. (F to G) Nucleation and growth of a secondary nanotwin (T2) via the consecutive emission of partial dislocations on the neighboring ( 1 ¯ 11 ) plane in T1. (E) Emission of a partial dislocation with a trailing SF into T1 from the TB kink under longitudinal tensile loading (shown by the white arrow). M and T1 denote the matrix and primary twin, respectively, on either side of the TB, where a six-atom-layer kink and several single-atom-layer steps preexisted on the TB. (D) As-received -oriented Au nanocrystal containing an inclined coherent TB, as confirmed by the inset fast Fourier transform pattern. ( D to G) Deformation snapshots showing the nucleation and growth of a secondary nanotwin from a TB kink in an Au nanocrystal. ![]() ( B and C) Atomic resolution TEM images showing the perfect TB and defective TB containing multiple kinks, respectively. ( A) TEM image showing parallel nanotwins in an as-deformed Au. ![]()
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