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Direct observation of deformation twinning under stress gradient in body-centered cubic metals

文献类型：期刊论文

作者Jiang, Binbin1,3; Tu, Aidong2,4; Wang, Hao4; Duan, Huichao2,3; He, Suyun2,3; Ye, Hengqiang3; Du, Kui3
刊名ACTA MATERIALIA
出版日期2018-08-15
卷号155页码:56-68
ISSN号1359-6454
关键词Deformation twinning BCC metals Stress gradient In situ electron microscopy
DOI10.1016/j.actamat.2018.05.061
通讯作者Du, Kui(kuidu@imr.ac.cn)
英文摘要In body-centered cubic (BCC) metals, plastic deformation usually takes place by deformation twinning under high strain rate. Although numerous efforts have been conducted on deformation twinning, the twinning mechanism is still shrouded in mystery. Here, we report a direct observation of deformation twinning in BCC tantalum and niobium by the use of in situ and aberration-corrected electron microscopy. Twin lamellae grow up from coherent twin boundaries by repeatedly extruding and subsequently expanding of bulges on the twin boundaries. A substantial stress gradient is detected around twin lamellae along the twinning direction. The twin growth can be described by a self-thickening mechanism through dislocation reactions at steps on coherent twin boundaries thus absent continuous supply of dislocations. The dislocation reactions can be activated and deactivated by the transition between normal step dislocations and complementary zonal dislocations. These results provide insights to deformation twinning in bulk BCC metals. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目National Natural Science Foundation of China[51521091] ; National Natural Science Foundation of China[51771203] ; National Natural Science Foundation of China[51390473] ; Chinese Academy of Sciences[QYZDJ-SSW-JSCO24]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000439675000006
资助机构National Natural Science Foundation of China ; Chinese Academy of Sciences
源URL[http://ir.imr.ac.cn/handle/321006/135853]  
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 Chinese Acad Sci, Beijing 100049, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
4.Chinese Acad Sci, Inst Met Res, Div Titanium Alloys, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式
GB/T 7714		 Jiang, Binbin,Tu, Aidong,Wang, Hao,et al. Direct observation of deformation twinning under stress gradient in body-centered cubic metals[J]. ACTA MATERIALIA,2018,155:56-68.
APA Jiang, Binbin.,Tu, Aidong.,Wang, Hao.,Duan, Huichao.,He, Suyun.,...&Du, Kui.(2018).Direct observation of deformation twinning under stress gradient in body-centered cubic metals.ACTA MATERIALIA,155,56-68.
MLA Jiang, Binbin,et al."Direct observation of deformation twinning under stress gradient in body-centered cubic metals".ACTA MATERIALIA 155(2018):56-68.

入库方式： OAI收割

来源：金属研究所

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