期刊
JOURNAL OF NUCLEAR MATERIALS
卷 543, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnucmat.2020.152478
关键词
Proton irradiation; Zirconium; Molecular dynamics
资金
- NSERC [IRC345857 16]
- NSERC/UNENE Industrial Research Chair in Nuclear Materials at Queen's University
This study presents an approach to determine the sensitivity of irradiation damage accumulation to the irradiation dose rate, and validates the model through experiments. The results show that the impact of the irradiation rate on damage accumulation varies in different scenarios, depending on the ratio of internal sink strength to the grain boundary sink strength.
We present an approach to determine the sensitivity of irradiation damage accumulation to the irradiation dose rate in polycrystalline systems, when the internal and boundary sink strengths are the only microstructural components affecting defect accumulation. A rate theory of defect removal is introduced, and suggests that the impact of the irradiation rate on damage accumulation depends on the ratio of internal sink strength to the grain boundary sink strength. The validity of the model is tested with two different methodologies: i) proton irradiation of coarse grain commercial alloy, Zircaloy-4 and ii) atomistic simulation of electron irradiation of nano-size pure zirconium. In case (i), the removal of defects at the grain boundary is negligible, and the sensitivity to irradiation rate is minimal. In case (ii), defect annihilation at the boundary dominates. In that scenario, if the grain boundary density increases by a factor n , the irradiation rate should increase by a factor n(2) times in order to achieve equivalent steady state damage accumulation. (C) 2020 Elsevier B.V. All rights reserved.
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