Plastic deformation induced extremely fine nano-grains in nickel

doi:10.1016/j.msea.2020.140664

IMR OpenIR

	Plastic deformation induced extremely fine nano-grains in nickel
	Guo, X. K.1,2; Luo, Z. P.1; Li, X. Y.1; Lu, K.1
通讯作者	Luo, Z. P.(zpluo@imr.ac.cn) ; Li, X. Y.(xyli@imr.ac.cn)
	2021-01-20
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	802 页码:9
摘要	Plastic deformation induced grain refinement was studied in a gradient nanostructure of nickel prepared from the surface mechanical grinding treatment at 77K. With increasing strains and strain rates, the deformation microstructures evolve from dislocation cells to nanolaminated structures of about 20-100 nm thick. With further straining, the nanolaminated structures are fragmented into equiaxed grains with size below 20 nm. The average grain size in the topmost surface layer is about 8 nm and the hardness is as high as 8.5 GPa. Dislocation slip dominated the plastic deformation in grains larger than about 60 nm. Below 60 nm, large amounts of twins formed. The fraction of grains containing twins increases in smaller grains and peaks at about 20 nm, indicating a dominating partial dislocation activity in deformation. With grain size smaller than 20 nm, both dislocation slip and twinning are limited, partial dislocation activities may assist subdivision of grains into few nanometers, as well as facilitate face-centered-cube to hexagonal-close-packed phase transformation in these extremely fine nano-grains. No inverse Hall-Petch relationship is observed at such a small grain size, which may be attributed to grain boundary relaxation during formation of these extremely fine nano-grains by plastic deformation.
关键词	Nano-grained metals Microstructure Deformation mechanism Partial dislocation HAADF-STEM
资助者	Ministry of Science & Technology of China ; National Science Foundation of China ; Chinese Academy of Sciences
DOI	10.1016/j.msea.2020.140664
收录类别	SCI
语种	英语
资助项目	Ministry of Science & Technology of China[2017YFA0204401] ; Ministry of Science & Technology of China[2017YFA0700700] ; National Science Foundation of China[51701216] ; National Science Foundation of China[51231006] ; Chinese Academy of Sciences[Zdyz201701]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000612562100003
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/160886
专题	中国科学院金属研究所
通讯作者	Luo, Z. P.; Li, X. Y.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Guo, X. K.,Luo, Z. P.,Li, X. Y.,et al. Plastic deformation induced extremely fine nano-grains in nickel[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,802:9.
APA	Guo, X. K.,Luo, Z. P.,Li, X. Y.,&Lu, K..(2021).Plastic deformation induced extremely fine nano-grains in nickel.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,802,9.
MLA	Guo, X. K.,et al."Plastic deformation induced extremely fine nano-grains in nickel".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 802(2021):9.