Bubble growth from clustered hydrogen and helium atoms in tungsten under a fusion environment

doi:10.1088/0029-5515/57/1/016006

HFCAS OpenIR > 中科院固体物理研究所

	Bubble growth from clustered hydrogen and helium atoms in tungsten under a fusion environment
	You, Yu-Wei 1; Kong, Xiang-Shan 1; Wu, Xuebang1 ; Liu, C. S.1; Chen, J. L.2; Luo, G. -N.2
	2017
发表期刊	NUCLEAR FUSION
摘要	Bubbles seriously degrade the mechanical properties of tungsten and thus threaten the safety of nuclear fusion devices, however, the underlying atomic mechanism of bubble growth from clustered hydrogen and helium atoms is still mysterious. In this work, first-principles calculations are therefore carried out to assess the stability of tungsten atoms around both hydrogen and helium clusters. We find that the closest vacancy-formation energies of interstitial hydrogen and helium clusters are substantially decreased. The first-nearest and second-nearest vacancy-formation energies close to vacancy-hydrogen clusters decrease in a step-like way to similar to 0, while those close to vacancy-helium clusters are reduced almost linearly to similar to-5.46 eV when atom number reaches 10. The vacancy-formation energies closest to helium clusters are more significantly reduced than those nearest to hydrogen clusters, whatever the clusters are embedded at interstitial sites or vacancies. The reduction of vacancy-formation energies results in instability and thus emission of tungsten atoms close to interstitial helium and vacancy-helium clusters, which illustrates the experimental results, that the tungsten atoms can be emitted from the vicinity of vacancy-helium clusters. In addition, the emission of unstable tungsten atoms close to hydrogen clusters may become possible once they are disturbed by the environment. The emission of tungsten atoms facilitates the growth and evolution of hydrogen and helium clusters and ultimately the bubble formation. The results also explain the bubble formation even if no displacement damage is produced in tungsten exposed to low-energy hydrogen and helium plasma.
文章类型	Article
关键词	Nulclear Fusion Tungsten Hydrogen And Helium Bubble
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1088/0029-5515/57/1/016006
关键词[WOS]	HIGH-FLUX ; LOW-ENERGY ; SUPERABUNDANT VACANCIES ; MOLECULAR-DYNAMICS ; TRANSITION-METALS ; DEUTERIUM PLASMA ; RETENTION ; SURFACE ; SIMULATIONS ; IRRADIATION
收录类别	SCI
语种	英语
项目资助者	National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Magnetic Confinement Fusion Program(2015GB112001) ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; National Natural Science Foundation of China(11405202 ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Youth Innovation Promotion Association of CAS(2015384) ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; Center for Computation Science, Hefei Institutes of Physical Sciences ; International Atomic Energy Agency ; International Atomic Energy Agency ; International Atomic Energy Agency ; International Atomic Energy Agency ; International Atomic Energy Agency ; International Atomic Energy Agency ; International Atomic Energy Agency ; International Atomic Energy Agency ; 11505229 ; 11505229 ; 11505229 ; 11505229 ; 11505229 ; 11505229 ; 11505229 ; 11505229 ; 11375231) ; 11375231) ; 11375231) ; 11375231) ; 11375231) ; 11375231) ; 11375231) ; 11375231)
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas ; Physics, Nuclear
WOS记录号	WOS:000385638600002
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/30136
专题	中科院固体物理研究所
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, POB 1129, Hefei 230031, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	You, Yu-Wei,Kong, Xiang-Shan,Wu, Xuebang,et al. Bubble growth from clustered hydrogen and helium atoms in tungsten under a fusion environment[J]. NUCLEAR FUSION,2017,57(1):1-10.
APA	You, Yu-Wei,Kong, Xiang-Shan,Wu, Xuebang,Liu, C. S.,Chen, J. L.,&Luo, G. -N..(2017).Bubble growth from clustered hydrogen and helium atoms in tungsten under a fusion environment.NUCLEAR FUSION,57(1),1-10.
MLA	You, Yu-Wei,et al."Bubble growth from clustered hydrogen and helium atoms in tungsten under a fusion environment".NUCLEAR FUSION 57.1(2017):1-10.

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