Plasticity of irradiated materials at the nano and micro-scales

Yinan Cui, Nasr Ghoniem, Giacomo Po

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number152746
JournalJournal of Nuclear Materials
Volume546
DOIs
StatePublished - Apr 1 2021

Keywords

  • Dislocation channel
  • Dislocation dynamics
  • Irradiation hardening
  • Plastic flow localization
  • Plastic instability

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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