Twinning and sequential kinking in lamellar Ti-6Al-4V alloy

doi:10.1016/j.actamat.2019.10.010

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	Twinning and sequential kinking in lamellar Ti-6Al-4V alloy
	Zheng, Xiaodong 1,2; Zheng, Shijian 1,3; Wang, Jian 4; Ma, Yingjie 5; Wang, Hao 5; Zhou, Yangtao 1,2; Shao, Xiaohong 1,2; Zhang, Bo 1,2; Lei, Jiafeng 5; Yang, Rui 5
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.