Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 524, Issue -, Pages 9-20Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2019.06.027
Keywords
W-Re alloy; Molecular dynamics; High-energy collision cascades; Defects
Funding
- National MCF Energy R&D Program of China [2018YFE0308100]
- National Natural Science Foundation of China [51771073, 11675230, 11475232]
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High-energy collision cascades with an energy of up to 300 keV for the primary knock-on atom (PIGS) have been initially simulated in W and W-Re alloys containing 5 or 10 at.% Re atoms using the molecular dynamics method with recently fitted W-Re interatomic potentials. The effects of PIGS energy and Re concentration on defect production, defect clustering and states of dislocation loops have been quantitatively analysed. The results show that the presence of Re atoms does not significantly affect either the number of surviving defects or their clustered fractions. In addition, the interstitial dislocation loops are dominated by the 112<111> loops. Mixed interstitial loops with 112<111> and <100> Burgers vectors and interstitial loops that have the same Burgers vectors but are located on different habit planes have also been observed. Further analysis indicates that the pinning effect induced by the Re atom segregation leads to the lower mobility of the interstitial clusters and interstitial 112<111> loops in W-Re alloys than in pure W, which is expected to influence the subsequent evolution of radiation-induced defects in W-Re alloy. (C) 2019 Elsevier B.V. All rights reserved.
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