In-situ study of initiation and extension of nano-thick defect-free channels in irradiated nickel

doi:10.1016/j.jmst.2020.03.057

	In-situ study of initiation and extension of nano-thick defect-free channels in irradiated nickel
	Li, Shihao 1,5; Gao, Ning 2,3,4; Han, Weizhong 1
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2020-12-01
卷号	58 页码:114-119
关键词	Defect-free channel Dislocation loop In-situ Strain localization
ISSN号	1005-0302
DOI	10.1016/j.jmst.2020.03.057
通讯作者	Gao, Ning(ning.gao@sdu.edu.cn) ; Han, Weizhong(wzhanxjtu@mail.xjtu.edu.cn)
英文摘要	Radiation defects-induced plastic flow localization is the origin of loss of ductility in irradiated metals. Defect-free channels (DFCs) are a typical form of strain localization that lead to crack initiation and premature failure. A comprehensive understanding of the DFC dynamics is key to managing radiation boosted property degradation. Despite great research efforts, a clear mechanism of DFC remains unknown. Here, our in-situ tests on irradiated Ni pillars provide a real-time observation of the dynamics of DFCs, including DFC initiation, extension and thickening. The merging and spreading of dislocation loops serve as an alternative mechanism of dislocation sources that emit massive dislocations and initiate nano-thick DFCs inside the grain. Nano-thick DFCs were formed through chopping up or sweeping away of loops by mobile dislocations. Annihilation of opposite loops and interactions between loops and vacancies accelerate DFC extension. Activation of multiple dislocation sources and dislocation cross-slips are the mechanisms for DFC thickening. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Natural Science Foundation of China[51922082] ; National Natural Science Foundation of China[51971170] ; National Natural Science Foundation of China[51942104] ; National Natural Science Foundation of China[11675230] ; National Key Research and Development Program of China[2017YFB0702301] ; 111 Project of China[BP2018008]
WOS关键词	PRISMATIC DISLOCATION LOOPS ; ODS FERRITIC STEELS ; RADIATION-DAMAGE ; DYNAMICS ; DEFORMATION ; MICROSTRUCTURE ; MECHANISMS ; DEPENDENCE ; EVOLUTION ; ALLOYS
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000574648800015
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; 111 Project of China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/139684]
专题	中国科学院近代物理研究所
通讯作者	Gao, Ning; Han, Weizhong
作者单位	1.Xi An Jiao Tong Univ, Ctr Adv Mat Performance Nanoscale, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 3.Shandong Univ, Key Lab Particle Phys & Particle Irradiat, Qingdao 266237, Peoples R China 4.Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Peoples R China 5.Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China
推荐引用方式 GB/T 7714	Li, Shihao,Gao, Ning,Han, Weizhong. In-situ study of initiation and extension of nano-thick defect-free channels in irradiated nickel[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,58:114-119.
APA	Li, Shihao,Gao, Ning,&Han, Weizhong.(2020).In-situ study of initiation and extension of nano-thick defect-free channels in irradiated nickel.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,58,114-119.
MLA	Li, Shihao,et al."In-situ study of initiation and extension of nano-thick defect-free channels in irradiated nickel".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 58(2020):114-119.