Atomic-scale mechanisms of He/V ratio effect on helium bubble hardening in iron for neutron irradiated F/M steels

doi:10.1016/j.jnucmat.2020.152495

HFCAS OpenIR

	Atomic-scale mechanisms of He/V ratio effect on helium bubble hardening in iron for neutron irradiated F/M steels
	Shi, Jingyi 1,2,3; Liu, Xing 4; Peng, Lei 3; Huang, Jianjun 1; Sun, Huibin 2; Li, Jiangang1,5
	2020-12-15
发表期刊	JOURNAL OF NUCLEAR MATERIALS
ISSN	0022-3115
通讯作者	Peng, Lei(penglei@ustc.edu.cn)
摘要	The helium-to-vacancy (He/V) ratio is a key factor related to the helium bubble hardening mechanisms induced by neutron irradiation in ferritic/martensitic (F/M) steels as advanced nuclear structural materials. According to the helium bubble hardening results in F/M steel irradiated in the spallation neutron source, the interactions between a 1/2 < 111 >{110} edge dislocation and helium bubbles with various sizes of 0.7-3.0 nm in bcc-Fe under irradiation temperatures and room temperature was investigated by using molecular dynamics simulation. The effect of various He/V ratios in the ranges of zero to the highest He/V ratios, 1.85-4.0 of stable helium bubbles with no dislocation loop emission, on the interaction mechanisms was analyzed. The results indicated that the critical resolved shear stress (CRSS) drops rapidly to a very low stress level, and immediately bottoms out and rebounds to a very high stress level, when the He/V ratio increases from 1.0 to the highest He/V ratio. The significant change of CRSS values is not only related to the climbing degree of dislocation after releasing, but also related to the moment when the climb appears. A new repulsion mechanism of interaction between dislocation and bubble was proposed to elucidate the abnormal phenomena of the bottoming rebound of CRSS with a great climbing degree, according to the repelling interaction between helium bubble and superjog of dislocation with both strong compressive stress field. (C) 2020 Elsevier B.V. All rights reserved.
关键词	Helium bubble Hardening Ferritic/martensitic steel Helium-to-vacancy ratio Molecular dynamics
DOI	10.1016/j.jnucmat.2020.152495
关键词[WOS]	EDGE DISLOCATION ; BEHAVIOR ; SIMULATION ; DYNAMICS
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[11805131] ; National Natural Science Foundation of China-NSAF[U1730123] ; International Partnership Program of Chinese Academy of Sciences[Y16YZ17271]
项目资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China-NSAF ; International Partnership Program of Chinese Academy of Sciences
WOS研究方向	Materials Science ; Nuclear Science & Technology
WOS类目	Materials Science, Multidisciplinary ; Nuclear Science & Technology
WOS记录号	WOS:000583242500042
出版者	ELSEVIER
引用统计	被引频次：8[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/334002/105146
专题	中国科学院合肥物质科学研究院
通讯作者	Peng, Lei
作者单位	1.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China 2.Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China 3.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230027, Anhui, Peoples R China 4.Southwestern Inst Phys, Chengdu 610041, Sichuan, Peoples R China 5.Chinese Acad Sci, Inst Plasma Phys, Hefei 330031, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Shi, Jingyi,Liu, Xing,Peng, Lei,et al. Atomic-scale mechanisms of He/V ratio effect on helium bubble hardening in iron for neutron irradiated F/M steels[J]. JOURNAL OF NUCLEAR MATERIALS,2020,542.
APA	Shi, Jingyi,Liu, Xing,Peng, Lei,Huang, Jianjun,Sun, Huibin,&Li, Jiangang.(2020).Atomic-scale mechanisms of He/V ratio effect on helium bubble hardening in iron for neutron irradiated F/M steels.JOURNAL OF NUCLEAR MATERIALS,542.
MLA	Shi, Jingyi,et al."Atomic-scale mechanisms of He/V ratio effect on helium bubble hardening in iron for neutron irradiated F/M steels".JOURNAL OF NUCLEAR MATERIALS 542(2020).