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

doi:10.1016/j.micron.2020.102825

IMR OpenIR

	In situ observation of twin-assisted grain growth in nanometer-scaled metal
	He, Suyun 1,2; Wang, Chunyang 1; Qi, Lu 1,2; Ye, Hengqiang 1; Du, Kui 1
通讯作者	Du, Kui(kuidu@imr.ac.cn)
	2020-04-01
发表期刊	MICRON
ISSN	0968-4328
卷号	131 页码:8
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.
关键词	Nanometer-scaled materials Microstructure Grain boundaries Deformation twinning
资助者	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
DOI	10.1016/j.micron.2020.102825
收录类别	SCI
语种	英语
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
WOS类目	Microscopy
WOS记录号	WOS:000515209100001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：4[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/321006/137442
专题	中国科学院金属研究所
通讯作者	Du, Kui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 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	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.