Effect of Irradiation on Ni-Inconel/Incoloy Heterostructures in Multimetallic Layered Composites

We use molecular dynamics (MD) to study radiation-induced mixing through multi-metallic layered composites' interfaces for nuclear reactor applications. Here, we consider the Incoloy-Ni and the Inconel-Ni system with four different compositions of Inconel. We investigate the irradiated structure of these composites at different temperatures by performing successive 10 keV collision cascades simulations up to the radiation dose of 0.5 displacements per atom (dpa). We reveal a linear relationship between the interface thickness of the heterostructure with the radiation dose and the higher tendency of Cr for penetration in Ni. The lower migration barrier of Cr assists the formation of vacancies and interstitials. Our results indicate that the Incoloy 800H (Ni₃₂Cr₂₁Fe₄₇) has a high radiation resistance among all the considered compositions.