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Accumulation of beryllium and its effects on hydrogen retention in tungsten divertor

文献类型：期刊论文

作者He, Zhihai1; He, H. Y.1; Chen, J. L.3; Ding, R.3; Pan, B. C.1,2
刊名NUCLEAR FUSION
出版日期2018-10-01
卷号58期号:10页码:9
关键词plasma facing materials tungsten beryllium hydrogen first-principles calculations
ISSN号0029-5515
DOI10.1088/1741-4326/aad4f3
通讯作者Pan, B. C.(bcpan@ustc.edu.cn)
英文摘要Tungsten (W) and beryllium (Be), as superiorly structural materials, may mutually permeate into each other when used as the plasma-facing materials in a fusion reactor, and interact with hydrogen (H) which commonly exists in the fusion environment. By performing first-principles calculations, we investigate the interactions among W, Be and H in W materials. We find that multiple (up to 10) Be atoms can dissolve in W monovacancy to form nBe-V-w complexes, and these complexes can decrease the formation energy of a vacancy nearby, which in turn promotes the growth of nBe-V-w complexes. The presence of the nBe-V-w complexes reduces the retention of H in vacancy. However, we also find that a small amount of Be dissolved in the small-angle tilt grain boundary (GB) has no obvious influence on H retention, while a large amount of Be will promote the growth of cavities in the GB regions. In addition, the adsorbed Be atoms on W (001) surface are energetically favorable to aggregate together and form a monolayer structure. The presence of Be atomic layer can weaken the adsorption of H on W surface. This work provides a fundamental insight for understanding the accumulation of Be in W, as well as its effects on H retention. This work did not deal with the case relevant to the Be-W alloying phase, which requires further study.
WOS关键词ENERGY ; POINTS ; SYSTEM ; ALLOY
资助项目National Magnetic Confinement Fusion Program[2013GB107004] ; Fundamental Research Funds for the Central Universities[WK3510000005] ; National Natural Science Foundation of China[11105140] ; National Natural Science Foundation of China[11275191]
WOS研究方向Physics
语种英语
WOS记录号WOS:000440730700002
出版者IOP PUBLISHING LTD
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源URL[http://ir.hfcas.ac.cn:8080/handle/334002/37766]  
专题合肥物质科学研究院_中科院等离子体物理研究所
通讯作者Pan, B. C.
作者单位1.Univ Sci & Technol China, Dept Phys, Key Lab Strongly Coupled Quantum Matter Phys, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 He, Zhihai,He, H. Y.,Chen, J. L.,et al. Accumulation of beryllium and its effects on hydrogen retention in tungsten divertor[J]. NUCLEAR FUSION,2018,58(10):9.
APA He, Zhihai,He, H. Y.,Chen, J. L.,Ding, R.,&Pan, B. C..(2018).Accumulation of beryllium and its effects on hydrogen retention in tungsten divertor.NUCLEAR FUSION,58(10),9.
MLA He, Zhihai,et al."Accumulation of beryllium and its effects on hydrogen retention in tungsten divertor".NUCLEAR FUSION 58.10(2018):9.

入库方式： OAI收割

来源：合肥物质科学研究院

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