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

doi:10.1016/j.actamat.2018.05.061

IMR OpenIR

	Direct observation of deformation twinning under stress gradient in body-centered cubic metals
	Jiang, Binbin 1,2; Tu, Aidong 3,4; Wang, Hao 3; Duan, Huichao 1,4; He, Suyun 1,4; Ye, Hengqiang 1; Du, Kui 1
通讯作者	Du, Kui(kuidu@imr.ac.cn)
	2018-08-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	155 页码:56-68
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.
关键词	Deformation twinning BCC metals Stress gradient In situ electron microscopy
资助者	National Natural Science Foundation of China ; Chinese Academy of Sciences
DOI	10.1016/j.actamat.2018.05.061
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000439675000006
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：39[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/321006/135854
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, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Div Titanium Alloys, Shenyang 110016, Liaoning, Peoples R China 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei, Anhui, 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.