| 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 Author | Du, Kui(kuidu@imr.ac.cn) |
| 2018-08-15 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 155Pages:56-68 |
| Abstract | 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. |
| Keyword | Deformation twinning BCC metals Stress gradient In situ electron microscopy |
| Funding Organization | National Natural Science Foundation of China ; Chinese Academy of Sciences |
| DOI | 10.1016/j.actamat.2018.05.061 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000439675000006 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/135854 |
| 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, 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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