Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2020.152422
Keywords
Molecular dynamics simulation; Cascade overlap; Iron; Strain; Clustering
Funding
- National Natural Science Foundation of China [11602311]
- Natural Science Foundation of Guangdong Province, China [2014A030310165]
- Fundamental Research Funds for the Central Universities [45000-31610018]
- Guangzhou Science and Technology Project [201707020002]
- Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund
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Irradiation-induced damage accumulation in BCC iron under an applied mechanical strain was investigated using molecular dynamics (MD) simulations. We found that the application of tensile and compressive strains affects defect accumulation and cluster formation, albeit according to different mechanisms. At low doses, radiation damage in the form of point defect formation was dominant, while at high doses, large cluster formation dominated, in which the diffusivity D and binding energy E-b of the defects became important. The applied strain was found to result in monotonic decrements of the formation energy E-f of the Frenkel pair, leading to an increment in defect production with an increase in the applied strain at low doses. However, at high doses, both the compressive and tensile strains enhanced damage accumulation and promote the clustering process through competition between defect formation, diffusion, and binding. We believe our results will aid in providing a fundamental mechanistic understanding of the effects of strain on damage accumulation under high-dose irradiation. (C) 2020 Elsevier B.V. All rights reserved.
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