Annihilating vacancies via dynamic reflection and emission of interstitials in nano-crystal tungsten

doi:10.1088/1741-4326/aa80a8

CORC > 合肥物质科学研究院 > 中国科学院合肥物质科学研究院 > 中科院固体物理研究所

	Annihilating vacancies via dynamic reflection and emission of interstitials in nano-crystal tungsten
	Li, Xiangyan 1; Duan, Guohua 1,2,3; Xu, Yichun 1; Zhang, Yange 1; Liu, Wei 1; Liu, C. S.1; Liang, Yunfeng 4; Chen, Jun-Ling 5; Luo, G-N.5
刊名	NUCLEAR FUSION
	2017-11-01
卷号	57 期号:11
关键词	Nuclear Fusion Nano-crystalline Tungsten Radiation Damage Self-healing Grain Boundary
DOI	10.1088/1741-4326/aa80a8
文献子类	Article
英文摘要	Radiation damage not only seriously degrades the mechanical properties of tungsten (W) but also enhances hydrogen retention in the material. Introducing a large amount of defect sinks, e.g. grain boundaries (GBs) is an effective method for improving radiation-resistance of W. However, the mechanism by which the vacancies are dynamically annihilated at long timescale in nano-crystal W is still not clear. The dynamic picture for eliminating vacancies with single interstitials and small interstitial-clusters has been investigated by combining molecular dynamics, molecular statics and object Kinetic Monte Carlo methods. On one hand, the annihilation of bulk vacancies was enhanced due to the reflection of an interstitial-cluster of parallel < 111 > crowdions by the GB. The interstitial-cluster was observed to be reflected back into the grain interior when approaching a locally dense GB region. Near this region, the energy landscape for the interstitial was featured by a shoulder, different to the decreasing energy landscape of the interstitial near a locally loose region as indicative of the sink role of the GB. The bulk vacancy on the reflection path was annihilated. On the other hand, the dynamic interstitial emission efficiently anneals bulk vacancies. The single interstitial trapped at the GB firstly moved along the GB quickly and clustered to be the di-interstitial therein, reducing its mobility to a value comparable to that that for bulk vacancy diffusion. Then, the bulk vacancy was recombined via the coupled motion of the di-interstitial along the GB, the diffusion of the vacancy towards the GB and the accompanying interstitial emission. These results suggest that GBs play an efficient role in improving radiation-olerance of nano-crystal W via reflecting highly-mobile interstitials and interstitial-clusters into the bulk and annihilating bulk vacancies, and via complex coupling of in-boundary interstitial diffusion, clustering of the interstitial and vacancy diffusion in the bulk.
WOS关键词	GRAIN-BOUNDARIES ; RADIATION-DAMAGE ; ION IRRADIATIONS ; BCC TUNGSTEN ; FE ; DEFECTS ; ENVIRONMENTS ; SEGREGATION ; RESISTANCE ; BEHAVIORS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000408751300001
资助机构	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 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(11505215 ; 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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(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; National Natural Science Foundation of China(11505215 ; 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内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/33623]
专题	合肥物质科学研究院_中科院固体物理研究所
作者单位	1.Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, POB 1129, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China 3.Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China 4.Univ Tokyo, Res Artifacts, Ctr Engn RACE, Chiba 2778568, Japan 5.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiangyan,Duan, Guohua,Xu, Yichun,et al. Annihilating vacancies via dynamic reflection and emission of interstitials in nano-crystal tungsten[J]. NUCLEAR FUSION,2017,57(11).
APA	Li, Xiangyan.,Duan, Guohua.,Xu, Yichun.,Zhang, Yange.,Liu, Wei.,...&Luo, G-N..(2017).Annihilating vacancies via dynamic reflection and emission of interstitials in nano-crystal tungsten.NUCLEAR FUSION,57(11).
MLA	Li, Xiangyan,et al."Annihilating vacancies via dynamic reflection and emission of interstitials in nano-crystal tungsten".NUCLEAR FUSION 57.11(2017).