Fig. 2: In-situ atomic resolution TEM observation of the \(\{11\bar{2}1\}\) twinning and detwinning processes on the plane of shear. | Nature Communications

Fig. 2: In-situ atomic resolution TEM observation of the \(\{11\bar{2}1\}\) twinning and detwinning processes on the plane of shear.

From: In situ observation of the atomic shuffles during the {\({{11}}\bar{{{2}}}{{1}}\)} twinning in hexagonal close-packed rhenium

Fig. 2

The Re crystal was under \(\langle11\overline{2}13\rangle\)-oriented tension and compression during the twinning and detwinning, respectively. a–c Sequential TEM snapshots showing the twinning process. Orange-colored solid lines indicate the \(\left(11\bar{2}1\right)\) twin boundary. White lines indicate the original position of the twin boundary. Red arrows indicate the surface facets' evolution during the twinning process. Inset in (b) shows the FFT of the twinning region, showing an orientation relation that is consistent with that of a \(\left\{11\bar{2}1\right\}\) twin; therein, the pink and cyan squares indicate the reciprocal lattices of the twin and matrix, respectively. d and e Sequential TEM snapshots showing the detwinning process. Sections of the \(\left(11\bar{2}1\right)\) twin boundaries are indicated by lines with different colors. White arrows in a–e indicate the migration direction of steps (twinning disconnections) on the twin boundary. f Enlarged atomic resolution image of a twinning dislocation. The white circle indicates the twinning disconnection. Inset shows the unit cells of the matrix and the twin. Scale bar: a–c 500 pm, d, e 1 nm, f 500 pm.

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