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In situ observation of twin-assisted grain growth in nanometer-scaled metal
He, Suyun1,2; Wang, Chunyang1; Qi, Lu1,2; Ye, Hengqiang1; Du, Kui1
Corresponding AuthorDu, Kui(kuidu@imr.ac.cn)
2020-04-01
Source PublicationMICRON
ISSN0968-4328
Volume131Pages:8
AbstractFor 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.
KeywordNanometer-scaled materials Microstructure Grain boundaries Deformation twinning
Funding OrganizationNational 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
DOI10.1016/j.micron.2020.102825
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMicroscopy
WOS SubjectMicroscopy
WOS IDWOS:000515209100001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137442
Collection中国科学院金属研究所
Corresponding AuthorDu, Kui
Affiliation1.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
Recommended Citation
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.
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