fig4

Figure 4. ECCI images of the HAZ before and after cyclic loading at 4.2 K: (A) HAZ before fatigue, (B) the magnified view of the region marked by the dash rectangle in (A), (C) HAZ after fatigue, (D) the magnified view of the region marked by the dash rectangle in (C). ECCI: Electron channeling contrast imaging; HAZ: heat-affected zone.