Atomistic insights into the influence of hydrogen on crack propagation in tungsten

doi:10.1016/j.fusengdes.2023.114030

IMECH-IR > 非线性力学国家重点实验室

	Atomistic insights into the influence of hydrogen on crack propagation in tungsten
	Shi, Jun; Li, Bingchen; Li, Lei; Liu, Yifan; Fan, Xinyue; Peng Q(彭庆); Liang, Linyun; Jin, Shuo; Lu, Guanghong
通讯作者	Liang, Linyun(lyliang@buaa.edu.cn) ; Jin, Shuo(jinshuo@buaa.edu.cn)
发表期刊	FUSION ENGINEERING AND DESIGN
	2023-12-01
卷号	197 页码:11
ISSN	0920-3796
摘要	Tungsten (W) is regarded as a viable choice for plasma-facing materials in nuclear fusion reactors. However, its mechanical properties are significantly degraded by hydrogen (H) atoms during irradiation, of which the mechanism is still elusive. In this study, we conduct molecular dynamics (MD) simulations to study the impact of H atoms on the propagation of a crack in single crystal W. The results show that the propagation rate of the crack slows down with increasing temperature. This is due to the enhanced plastic deformation, leading to blunting of the crack tip. A pre-existing crack in W is then considered at various temperatures and uniaxial applied tensile strain conditions. The propagation rate of the crack decreases with the increase of the applied tensile strain rate. This phenomenon occurs due to the relaxation of the stress around the crack tip following the emission of the dislocation at high strain rates. After introducing H atoms, it can be observed that at low temperatures, H im-pedes the propagation of the crack, while at high temperatures, H promotes it. This is primarily due to the formation of voids at the slip traces of dislocations and the reduction in surface energy. Additionally, the crack tip becomes blunted and its propagation rate decreases with increasing strain rate. These results indicate that providing sufficient time for H atoms to migrate is a key factor affecting the mechanical properties of W. The current results provide valuable insights into understanding the interaction mechanism of a crack and H atoms in W.
关键词	Molecular dynamics simulation Hydrogen Crack propagation Plasma-facing materials Tungsten
DOI	10.1016/j.fusengdes.2023.114030
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001098538500001
关键词[WOS]	SINGLE-CRYSTAL ; STRAIN-RATE ; TRANSITION ; PLASTICITY ; TIP ; EMBRITTLEMENT ; SIMULATION ; MECHANISM ; BRITTLE ; STRESS
WOS研究方向	Nuclear Science & Technology
WOS类目	Nuclear Science & Technology
资助项目	National MCF Energy R & D Program of China[2018YFE0308103] ; National Natural Science Foundation of China[12075021] ; National Natural Science Foundation of China[12075023] ; National Natural Science Foundation of China[12272378] ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences[E1Z1011001] ; High-level Innovation Research Institute Program of Guangdong Province[2020B0909010003]
项目资助者	National MCF Energy R & D Program of China ; National Natural Science Foundation of China ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences ; High-level Innovation Research Institute Program of Guangdong Province
论文分区	二类
力学所作者排名	3+
RpAuthor	Liang, Linyun ; Jin, Shuo
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/93371
专题	非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Shi, Jun,Li, Bingchen,Li, Lei,et al. Atomistic insights into the influence of hydrogen on crack propagation in tungsten[J]. FUSION ENGINEERING AND DESIGN,2023,197:11.
APA	Shi, Jun.,Li, Bingchen.,Li, Lei.,Liu, Yifan.,Fan, Xinyue.,...&Lu, Guanghong.(2023).Atomistic insights into the influence of hydrogen on crack propagation in tungsten.FUSION ENGINEERING AND DESIGN,197,11.
MLA	Shi, Jun,et al."Atomistic insights into the influence of hydrogen on crack propagation in tungsten".FUSION ENGINEERING AND DESIGN 197(2023):11.

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