Plasticity of irradiated materials at the nano and micro-scales

Cui, Yinan; Ghoniem, Nasr; Po, Giacomo

doi:10.1016/j.jnucmat.2020.152746

Plasticity of irradiated materials at the nano and micro-scales

Journal Article · Wed Dec 30 23:00:00 EST 2020 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2020.152746· OSTI ID:1852652

Cui, Yinan ^[1]; Ghoniem, Nasr ^[2]; Po, Giacomo ^[3]

Tsinghua Univ., Beijing (China); Tsinghua Univ., Beijing (China)
Univ. of California, Los Angeles, CA (United States)
Univ. of Miami, FL (United States)

Here, we review here our recent work on plastic deformation in irradiated materials at the nano- and micro-scales, as revealed by Discrete Dislocation Dynamics (DDD) simulations. Two methods of including irradiation effects in the DDD framework are presented. The first directly captures the atomistic interaction mechanisms, while the second can effectively study high-dose irradiation. Computer simulations lead to new understanding of the dynamics of collective dislocation-irradiation defect interactions, as well as the quantitative analysis of the temporal and spatial characteristics associated with plastic instabilities. Based on these insights, theoretical models are developed to predict the critical conditions for dislocation channel formation. A simple probability model is proposed and demonstrated to predict the width of dislocation channels in bulk irradiated materials with good agreement with experimental data. The fundamental understanding of the origins of plastic flow localization in irradiated materials sheds light on the design of future generations of radiation-resistant materials.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Natural Science Foundation of China

Grant/Contract Number:: SC0018410

OSTI ID:: 1852652

Alternate ID(s):: OSTI ID: 1776064

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 546; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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