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Title: Grain boundary motion assisted via radiation cascades in bcc Fe

Abstract

Molecular-dynamic simulations were performed to study the influence of displacement cascades on grain boundary (GB) structure and stability in bcc Fe. A {sigma}=5, (310)[001] symmetric tilt boundary with a tilt angle of {theta}=36.9 deg. was used for the simulations. We find that GB motion, either sliding or migration, is activated under the influence of displacement cascades at lower internal stresses as compared to the unirradiated GBs. We postulate that radiation-induced GB damage aids the nucleation mechanisms that trigger GB motion. Furthermore, radiation-induced GB sliding significantly relaxes internal stress and may provide a viable mechanism for promoting irradiation creep via GB accommodation processes.

Authors:
; ;  [1]
  1. CANMET-Materials Technology Laboratory, Natural Resources Canada, Ottawa, Ontario, K1A 0G1 (Canada)
Publication Date:
OSTI Identifier:
21192453
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 78; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevB.78.134114; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BCC LATTICES; CREEP; CRYSTAL DEFECTS; GRAIN BOUNDARIES; IRON; IRRADIATION; MIGRATION; MOLECULAR DYNAMICS METHOD; NUCLEATION; RESIDUAL STRESSES; SIMULATION; SLIP; STABILITY

Citation Formats

Campana, Carlos, Boyle, K P, Miller, Ronald E, and Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, K1S 5B6. Grain boundary motion assisted via radiation cascades in bcc Fe. United States: N. p., 2008. Web. doi:10.1103/PHYSREVB.78.134114.
Campana, Carlos, Boyle, K P, Miller, Ronald E, & Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, K1S 5B6. Grain boundary motion assisted via radiation cascades in bcc Fe. United States. https://doi.org/10.1103/PHYSREVB.78.134114
Campana, Carlos, Boyle, K P, Miller, Ronald E, and Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, K1S 5B6. 2008. "Grain boundary motion assisted via radiation cascades in bcc Fe". United States. https://doi.org/10.1103/PHYSREVB.78.134114.
@article{osti_21192453,
title = {Grain boundary motion assisted via radiation cascades in bcc Fe},
author = {Campana, Carlos and Boyle, K P and Miller, Ronald E and Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, K1S 5B6},
abstractNote = {Molecular-dynamic simulations were performed to study the influence of displacement cascades on grain boundary (GB) structure and stability in bcc Fe. A {sigma}=5, (310)[001] symmetric tilt boundary with a tilt angle of {theta}=36.9 deg. was used for the simulations. We find that GB motion, either sliding or migration, is activated under the influence of displacement cascades at lower internal stresses as compared to the unirradiated GBs. We postulate that radiation-induced GB damage aids the nucleation mechanisms that trigger GB motion. Furthermore, radiation-induced GB sliding significantly relaxes internal stress and may provide a viable mechanism for promoting irradiation creep via GB accommodation processes.},
doi = {10.1103/PHYSREVB.78.134114},
url = {https://www.osti.gov/biblio/21192453}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 13,
volume = 78,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 2008},
month = {Wed Oct 01 00:00:00 EDT 2008}
}