fig12

Figure 12. TEM analysis of as-extruded alloy: (A) TEM image showing a certain amount of nano-scale granular-shaped phases; (B) phase size distributions of nano-scale phases; (C) high-resolution TEM image and (D and E) the corresponding FFT patterns of phases A and B, respectively; (F-I) TEM images showing partial nano-scale phases segregated at the GBs. TEM: Transmission electron microscope; FFT: Fast Fourier transformation; GBs: grain boundaries.