Energetically favorable dislocation/nanobubble bypass mechanism in irradiation conditions

نویسندگان

چکیده

With exposure to high-energy particle irradiation, structural metals develop a number of nanoscale defects, one which is the nano-sized He bubble. Formed throughout material, these bubbles can directly impair movement dislocations and dramatically alter mechanical performance. Propagating edge in face-centered cubic metals, driven under sufficient forces, are expected cut through bubbles, due higher energetic expense. Here, using atomistic simulations for model Cu we find that when He-vacancy ratio bubble diameter become sufficiently large spacing reduced below threshold, an extended dislocation engages multi-step-bypass (MSB) maneuver change its glide plane overcome at room temperature. This unanticipated MSB mechanism provides more energetically favorable pathway compared conventional bypass mechanisms severe conditions.

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ژورنال

عنوان ژورنال: Acta Materialia

سال: 2022

ISSN: ['1873-2453', '1359-6454']

DOI: https://doi.org/10.1016/j.actamat.2022.117849