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Cascade damage annealing analyses using kinetic Monte Carlo method

Suzudo, Tomoaki   ; Yamaguchi, Masatake   ; Tsuru, Tomohito   ; Hamaguchi, Dai; Golubov, S.*; Stoller, R.*

Cascade displacements in structural nuclear materials cannot be observed by experimental methods, and molecular dynamics (MD) is the only tool to investigate such a phenomenon. Nevertheless, time length MD can follow is 100 ps, and MD is not available for the long-term analysis of radiation damage. Thus the application of kinetic Monte Carlo method to annealing simulations starting from the results given by cascade damage MD simulations is of importance. Recently the understanding of the migration of self-interstitial atom cluster were newly established, and we reevaluated the annealing behavior using the new theory. The results indicated that the radiation damage in Fe is overestimated in the past study. This work is useful for the R&D of nuclear materials.

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