On the irradiation tolerance of nano-grained Ni–Mo–Cr alloy: 1 MeV He+ irradiation experiment

The irradiation damage behavior was studied in the nano-grained Ni–Mo–Cr alloy (nano-grained GH3535), which irradiated by He ion to various dose. evolution of defects and hardness changes are characterized transmission electron microscopy nanoindentation explore tolerance GH3535 coarse-grained (annealed where later chosen as reference material make comparison with GH3535. results show that though both average size number density bubbles increase an dose, smaller volume fraction is found compared under same condition. This indicates possess better swelling resistance than However, more significant suggests stronger irradiation-induced hardening comparing alloy, due impeding effect caused grain boundaries decorated bubbles. study provides insight into design irradiation-tolerant nickel-based alloys for nuclear industry applications.