Impact Factor:3.555

DOI number:10.1016/j.jnucmat.2022.153818

Affiliation of Author(s):Hefei University of Technology

Journal:Journal of Nuclear Materials

Key Words:Twin boundary Radiation damage Mechanical properties Deformation mechanism Dislocation evolution

Abstract:Molecular dynamics (MD) simulations are applied to explore the defect evolution of single-crystal iron (SC Fe) and bicrystalline iron (BC Fe) under irradiation with 100 KeV energy at 673 K, and their mechan- ical properties and deformation mechanism under uniaxial tension at 300 K. The results show that twin boundary can significantly reduce the peak value of Frenkel defects, and enhance the defect clustering to inhibit the growth of clusters defects. The hardening behaviour is closely related to the fractions of recombinant point defects, while the unrecoverable point defects would transit to voids for the reduc- tion of strength. Twin boundary can capture some small voids and inhibit the coelescence and growth of voids for reduction of strength loss. Additionally, it can effectively enhance the irradiation brittleness resistance through the inhabition of loss of dislocation density after irradiation. The plastic deformations of the SC Fe models depend on the operation of atomic slip system with high dislocation density, while irradiation will lead to the transformation of plastic deformation mechanism into emission and motion of shear dislocation loops (SDLs) with lower dislocation density. The plastic deformation mechanisms of the Σ3 (11–2) BC Fe are phase transformation, and SDLs emission and motion, while those of the Σ11 (332) BC Fe are only SDLs emission and motion. Irradiation hardly affects the plastic deformation of BC Fe.

Co-author:Miao Meng,Kemin Xue

First Author:Lusheng Wang

Indexed by:Journal paper

Correspondence Author:Siliang Yan,Ping Li

Document Code:153818

Discipline:Engineering

Document Type:J

Volume:567

Issue:-

Page Number:1-14

Translation or Not:no

Date of Publication:2022-08-15

Included Journals:SCI、EI

Links to published journals:https://www.sciencedirect.com/science/article/pii/S002231152200304X?via%3Dihub

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