Abstract
Inconel 718 samples were irradiated with 50keV He+ ions at 300°C to 0.4, 4 and 40dpa. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the surface nanostructure, partially dissolved γ″ precipitates, dislocation-precipitates (γ′ and γ″) interactions and microstructure variation. Dislocation-precipitates (γ″) interactions were investigated to better understand the microstructure variation of irradiated samples. For the sample irradiated to 0.4dpa, the dislocation-precipitates (γ″) interaction was depicted depending on the effective size of γ″ precipitates. On the basis of the dislocation-precipitates (γ″) interaction, a peanut-like complex that composed of precipitates, dislocation loops and trailing dislocations was proposed as the nucleation mechanism for the generation of dislocation cells in sample irradiated to 4dpa. In the sample irradiated to a dose of 40dpa, the formation of subgrains was studied based on the peanut-like complex model. Besides, slip band was considered as the alternative mechanism for the migration of accumulated dislocations.
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