| 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 Author | Du, Kui(kuidu@imr.ac.cn) |
| 2020-04-01 | |
| Source Publication | MICRON
 |
| ISSN | 0968-4328 |
| Volume | 131Pages:8 |
| Abstract | 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. |
| Keyword | Nanometer-scaled materials Microstructure Grain boundaries Deformation twinning |
| Funding Organization | 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 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Microscopy |
| WOS Subject | Microscopy |
| WOS ID | WOS:000515209100001 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/137442 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Du, Kui |
| Affiliation | 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 |
| 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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