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. 2020 May 18;11:2483. doi: 10.1038/s41467-020-16351-0

Fig. 1. Direct observation of a twinning nucleation process.

Fig. 1

a–c Sequential HRTEM images showing twinning nucleation in a HCP rhenium nanocrystal under < 1 −1 0 0 > -oriented compression. Arrows indicate the expansion of basal layers in the twin embryo. Turquoise lines indicate the Prismatic│Basal (P│B) interfaces between the twin embryo and matrix. White lines indicate the grain boundary (GB). Block arrow in a indicates the loading direction. d Fast Fourier transformation of the twin embryo in c. TBN, MPN, TPN, MBN, TTPN, and MTPN mean the plane normal directions of twin basal, matrix prismatic, twin prismatic, matrix basal, twin twinning plane and matrix twinning plane, respectively. e Morphology of the twin as it grew. Yellow lines indicate the coherent twin boundaries (CTB). Scale bars in a–c, e, 2 nm.