Fig. 4 | Nature Communications

Fig. 4

From: Hierarchical nanostructured aluminum alloy with ultrahigh strength and large plasticity

Fig. 4

Plastic deformation mechanism of the hierarchical nanostructured Al alloy. a Cross-sectional TEM image of a 1 μm-diameter pillar after compression. b Enlarged TEM image from white dashed rectangle area in (a). The red arrows indicate the positions of some dark regions. c HRTEM image near nano-lamellar grains G1, G2, and G3, clearly demonstrates the existence of the amorphous phase (glass layer) after deformation. d HRTEM image near nano-lamellar grains G4, G5, and G6. The nano-sized MG phase is colored by light yellow. The lower right inset is inverse Fourier transformation (IFT) image of the dashed square area in the main image, showing some of the dislocations ‘’. e Illustration of dislocations’ activities interacted with the nano-sized MG phase. A dislocation (‘’) is generated on the glass-grain 2 interface and then moves inside grain 2. Another dislocation (‘’) moves inside grain 1 and then is absorbed by the atoms on the edge of the nano-sized MG phase (dislocation annihilation). The red and blue spheres represent mobile and less mobile atoms respectively. The dashed circles represent the original positions of the mobile atoms. The black arrows denote the motion directions of the dislocations

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