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Direct observation of deformation twinning under stress gradient in body-centered cubic metals
Jiang, Binbin1,2; Tu, Aidong3,4; Wang, Hao3; Duan, Huichao1,4; He, Suyun1,4; Ye, Hengqiang1; Du, Kui1
Corresponding AuthorDu, Kui(kuidu@imr.ac.cn)
2018-08-15
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume155Pages:56-68
AbstractIn 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.
KeywordDeformation twinning BCC metals Stress gradient In situ electron microscopy
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences
DOI10.1016/j.actamat.2018.05.061
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000439675000006
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/135854
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, 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
Recommended Citation
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.
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