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Coupling Multi-Scale Mechanical Testing Techniques with FIB and TEM Characterization to Reveal Mechanisms of Embrittlement of High Dose Inconel X-750

In this study, advanced microscopy techniques are used to investigate bulk mechanical testing and small scale testing of heavily irradiated Inconel X-750 to elucidate the mechanisms of embrittlement and fracture. When subjected to a high thermal flux, the naturally occurring Ni-58 in X-750 undergoes transmutation reactions, (n,α), (n,p) and (n,γ), which results in an enhancement of the total atomic displacement damage (dpa), and the production of high concentrations of Helium and Hydrogen [1]. Material in this investigation has been irradiated up to 84 dpa and 26000 appm Helium. Bulk component testing has shown that the material has lost strength and ductility following irradiation, and that the fracture surfaces are brittle, mixed mode, which are predominantly intergranular, with evidence of transgranular facets (Figure 1 a) [2, 3]. In-situ, small scale mechanical testing has been performed in attempt to assess the grain boundary strength [2, 4]; however, the grain boundaries were found to be inherently stronger than the bulk material [2, 4], and the easiest fracture path occurs exclusively along flow localization pathways (i.e., shear bands) consistent with the transgranular facets observed in the bulk fracture surfaces in Figure 1 a.