Twinning and sequential kinking in lamellar Ti-6Al-4V alloy | |
Zheng, Xiaodong1,2; Zheng, Shijian1,3; Wang, Jian4; Ma, Yingjie5; Wang, Hao5; Zhou, Yangtao1,2; Shao, Xiaohong1,2; Zhang, Bo1,2; Lei, Jiafeng5; Yang, Rui5 | |
刊名 | Acta Materialia |
2019-12-01 | |
卷号 | 181页码:479-490 |
关键词 | Crack tips Cyclic loads Fracture toughness High resolution transmission electron microscopy Interfaces (materials) Ternary alloys Titanium alloys Titanium metallography Toughness Twinning Alpha/beta interface Body-centered cubic Deformation mechanism Deformation modes Deformation twin Hexagonal close packed kinking Ti-6 Al-4 V |
ISSN号 | 13596454 |
DOI | 10.1016/j.actamat.2019.10.010 |
英文摘要 | Fully lamellar Ti-6Al-4V alloys comprise body-centered cubic (BCC) β lamellae in large-sized, hexagonal close-packed (HCP) α colonies and exhibit outstanding toughness. Although α/β interfaces are considered to play a key role in plastic deformation connected to the toughness, the interface effects have not been revealed so far. In this work, we studied underlying deformation mechanisms of interface-related deformation modes at an atomic scale. After the cyclic loading, {11¯02} deformation twins were observed in the vicinity of fatigue crack surfaces. Moreover, the α/β interface structures before and after cyclic loading deformation were characterized via transmission electron microscopy (TEM). The initial α/β interfaces can be described by the terrace ledge kink model, consisting of (011¯0)α||(1¯21)β terrace plane and (1¯100)α||(1¯01)β ledge plane. TEM investigations reveal that deformation twins nucleate at the α/β interface and the corresponding nucleation is ascribed to the dissociation of basal type dislocations. More importantly, these twins can continuously propagate through multiple β phase lamella. The continuous propagation of twinning is accomplished through double kinking mechanism. In this manner, twinning in α phases and sequential kinking in β phases can effectively release the stress intensification at the crack tip and dissipate plastic work/energy, correspondingly enhancing fracture toughness of fully lamellar Ti-6Al-4V. © 2019 Acta Materialia Inc. |
WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
语种 | 英语 |
出版者 | Acta Materialia Inc |
WOS记录号 | WOS:000498749300041 |
内容类型 | 期刊论文 |
源URL | [http://ir.lut.edu.cn/handle/2XXMBERH/114927] |
专题 | 材料科学与工程学院_特聘教授组 |
作者单位 | 1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang; 110016, China; 2.School of Material Science and Engineering, University of Science and Technology of China, Hefei; 230026, China; 3.Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin; 300130, China; 4.Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln; NE; 68588, United States; 5.Institute of Metal Research, Chinese Academy of Sciences, Shenyang; 110016, China; 6.School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China |
推荐引用方式 GB/T 7714 | Zheng, Xiaodong,Zheng, Shijian,Wang, Jian,et al. Twinning and sequential kinking in lamellar Ti-6Al-4V alloy[J]. Acta Materialia,2019,181:479-490. |
APA | Zheng, Xiaodong.,Zheng, Shijian.,Wang, Jian.,Ma, Yingjie.,Wang, Hao.,...&Ma, Xiuliang.(2019).Twinning and sequential kinking in lamellar Ti-6Al-4V alloy.Acta Materialia,181,479-490. |
MLA | Zheng, Xiaodong,et al."Twinning and sequential kinking in lamellar Ti-6Al-4V alloy".Acta Materialia 181(2019):479-490. |
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