In situ observation of twin-assisted grain growth in nanometer-scaled metal

doi:10.1016/j.micron.2020.102825

CORC > 金属研究所 > 中国科学院金属研究所

	In situ observation of twin-assisted grain growth in nanometer-scaled metal
	He, Suyun 1,2; Wang, Chunyang 2; Qi, Lu 1,2; Ye, Hengqiang 2; Du, Kui 2
刊名	MICRON
	2020-04-01
卷号	131 页码:8
关键词	Nanometer-scaled materials Microstructure Grain boundaries Deformation twinning
ISSN号	0968-4328
DOI	10.1016/j.micron.2020.102825
通讯作者	Du, Kui(kuidu@imr.ac.cn)
英文摘要	For nanometer-scaled materials, grain boundary behaviors, such as grain coalescence and grain boundary migration, contribute significantly to the plasticity of materials. While mechanically driven grain growth has been observed in nanometer-scaled metals, its underlying mechanisms are still poorly understood especially for those correlated with twins. By using in situ aberration-corrected transmission electron microscopy and precession electron diffraction, we have directly revealed nanotwin assisted grain growth for low angle grain boundaries. The grains with low angle grain boundaries coalesce by firstly forming twin pairs, whose coherent twin boundaries then serve as fast lanes for dislocations, and thus dissolving the low angle grain boundaries. During this process, the constitute dislocations of the low angle grain boundaries decompose into Shockley partial dislocations, which subsequently move along the coherent twin boundaries. After all the constitute dislocations dissociate and move out, two grains will coalesce and twin pairs merge into complete twin lamellae. For high angle grain boundaries, portions of grain boundaries intersected with nanotwins show higher mobility for migration under external stress. This investigation provides insight to twin related grain boundary behaviors in nanometer-scaled metals.
资助项目	National Key Research and Development Program of China[2017YFA0700701] ; Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences[QYZDJ-SSW-JSCO24] ; National Natural Science Foundation of China[91960202] ; Shenyang National Laboratory for Materials Science[L2019F14]
WOS研究方向	Microscopy
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000515209100001
资助机构	National Key Research and Development Program of China ; Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences ; National Natural Science Foundation of China ; Shenyang National Laboratory for Materials Science
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/137441]
专题	金属研究所_中国科学院金属研究所
通讯作者	Du, Kui
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	He, Suyun,Wang, Chunyang,Qi, Lu,et al. In situ observation of twin-assisted grain growth in nanometer-scaled metal[J]. MICRON,2020,131:8.
APA	He, Suyun,Wang, Chunyang,Qi, Lu,Ye, Hengqiang,&Du, Kui.(2020).In situ observation of twin-assisted grain growth in nanometer-scaled metal.MICRON,131,8.
MLA	He, Suyun,et al."In situ observation of twin-assisted grain growth in nanometer-scaled metal".MICRON 131(2020):8.