fig13

Figure 13. Microstructure of heterogeneous lamella Ti. (A) Electron backscattered diffraction (EBSD) image of initial coarse grain Ti. (B) and (C) TEM images showing nonuniform elongated lamellae in the central layer and nanograins in the top ~25 μm surface layer. (D) EBSD image of heterogeneous lamella Ti after partial recrystallization. (E) EBSD image of recrystallized grains larger than 1 μm. (F) Cross-sectional TEM image of recrystallized grain lamellae with two ultrafine-grained lamellae on two sides^[97].