Features of plasticity nucleation in deformed vanadium crystallite under irradiation

AV Korchuganov and DS Kryzhevich and KP Zolnikov, 6TH INTERNATIONAL CONGRESS ENERGY FLUXES AND RADIATION EFFECTS, 1115, 032015 (2018).

DOI: 10.1088/1742-6596/1115/3/032015

Molecular dynamics simulation of the defect structure nucleation in deformed vanadium crystallites under irradiation was carried out taking into account their internal structure. The crystallites studied contained grain boundaries of different types. The behavior of crystallites deformed to values close to the limit of elasticity under irradiation was simulated by the generation of atomic displacement cascades. The energy of the primary knock-on atoms which generated atomic displacement cascades was 5 keV. It was found that atomic displacement cascades in elastically deformed crystallites can lead not only to the formation of radiation defects, but also cause plasticity. It is shown that the nucleation of plasticity in crystallite is associated with elastic waves. These waves are formed in the region of atomic displacement cascade development. Their generation is due to the high-speed thermal expansion of the region in which atomic displacement cascade develops.

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