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Strong trapping and slow diffusion of helium in a tungsten grain boundary
Wang, Xin-Xin; Niu, Liang-Liang; Wang, Shaoqing; Niu, LL (reprint author), Beihang Univ, Dept Phys, Beijing 100191, Peoples R China.
2017-04-01
Source PublicationJOURNAL OF NUCLEAR MATERIALS
ISSN0022-3115
Volume487Pages:158-166
AbstractWe have investigated the segregation, trapping and diffusion of He in a Sigma 3 < 110 >{111} W grain boundary (GB) using combined techniques of ab initio and classical atomistic simulations. We show that, with an average segregation energy of -3.20 eV, the strong He trapping can be attributed to a GB interstitial trapping or a vacancy trapping mechanism, while an average energy barrier of 1.97 eV leads to a slow diffusion of He in the GB plane. We further reveal by molecular dynamics simulations that the He diffusion will be dictated by GB migration through the motion of GB disconnections. Interestingly, we also observe a He-induced GB structural transition in classical simulations. The present work suggests that the GB does not provide fast transport channel for He, providing useful reference for the possible application of polycrystalline W under He irradiation in advanced nuclear fusion reactors. (C) 2017 Elsevier B.V. All rights reserved.; We have investigated the segregation, trapping and diffusion of He in a Sigma 3 < 110 >{111} W grain boundary (GB) using combined techniques of ab initio and classical atomistic simulations. We show that, with an average segregation energy of -3.20 eV, the strong He trapping can be attributed to a GB interstitial trapping or a vacancy trapping mechanism, while an average energy barrier of 1.97 eV leads to a slow diffusion of He in the GB plane. We further reveal by molecular dynamics simulations that the He diffusion will be dictated by GB migration through the motion of GB disconnections. Interestingly, we also observe a He-induced GB structural transition in classical simulations. The present work suggests that the GB does not provide fast transport channel for He, providing useful reference for the possible application of polycrystalline W under He irradiation in advanced nuclear fusion reactors. (C) 2017 Elsevier B.V. All rights reserved.
description.department[wang, xin-xin ; wang, shaoqing] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china ; [wang, xin-xin] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china ; [niu, liang-liang] beihang univ, dept phys, beijing 100191, peoples r china ; [niu, liang-liang] univ michigan, dept nucl engn & radiol sci, ann arbor, mi 48109 usa
KeywordGrain Boundary Helium Segregation Diffusion Tungsten
Subject AreaMaterials Science, Multidisciplinary ; Nuclear Science & Technology
Funding OrganizationNational Major Research Program of China [2016YFB0701302]; Informalization Construction Project of Chinese Academy of Sciences during the 11th Five Year Plan Period [INFO-115-b01]; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase)
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78206
Collection中国科学院金属研究所
Corresponding AuthorNiu, LL (reprint author), Beihang Univ, Dept Phys, Beijing 100191, Peoples R China.
Recommended Citation
GB/T 7714
Wang, Xin-Xin,Niu, Liang-Liang,Wang, Shaoqing,et al. Strong trapping and slow diffusion of helium in a tungsten grain boundary[J]. JOURNAL OF NUCLEAR MATERIALS,2017,487:158-166.
APA Wang, Xin-Xin,Niu, Liang-Liang,Wang, Shaoqing,&Niu, LL .(2017).Strong trapping and slow diffusion of helium in a tungsten grain boundary.JOURNAL OF NUCLEAR MATERIALS,487,158-166.
MLA Wang, Xin-Xin,et al."Strong trapping and slow diffusion of helium in a tungsten grain boundary".JOURNAL OF NUCLEAR MATERIALS 487(2017):158-166.
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