Fig. 6: In situ observation of recoverable FCC-2H phase transition.
From: Chemical inhomogeneity–induced profuse nanotwinning and phase transformation in AuCu nanowires
a–f A sequence of enlarged HRTEM images showing the 2H phase generation and FCC–HCP–FCC phase transition process. a–c A series of enlarged HRTEM images shows that the generation of partial dislocations a single atomic layer away from each other leads to the HCP (2H) phase formation. d The generation of SFs a single atomic layer away from the HCP phase boundary was repeated with further straining, leading to the growth of the HCP phase. e, f This restoration of the FCC–HCP phase occurred via activation of the partial dislocations in the HCP phase. SF1 and SF2 represent stacking faults (SFs), and nanotwins are marked T1–T4. The scale bar is 1 nm. g–l Schematic illustrations of the process to show the recoverable FCC–HCP phase transition more clearly.
