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

doi:10.1016/j.actamat.2019.10.010

	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
	2019-12-01
发表期刊	Acta Materialia
ISSN	13596454
卷号	181 页码:479-490
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.
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
DOI	10.1016/j.actamat.2019.10.010
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000498749300041
出版者	Acta Materialia Inc
EI入藏号	20194307575497
EI主题词	Aluminum alloys
EI分类号	408.1 Structural Design, General - 541.2 Aluminum Alloys - 542.3 Titanium and Alloys - 741.3 Optical Devices and Systems - 933.1.2 Crystal Growth - 951 Materials Science
来源库	Compendex
分类代码	408.1 Structural Design, General - 541.2 Aluminum Alloys - 542.3 Titanium and Alloys - 741.3 Optical Devices and Systems - 933.1.2 Crystal Growth - 951 Materials Science
引用统计	被引频次：67[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/114927
专题	材料科学与工程学院_特聘教授组
通讯作者	Zheng, Shijian; Wang, Jian
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China; 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China; 3.Hebei Univ Technol, Tianjin Key Lab Mat Laminating Fabricat & Interfa, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China; 4.Univ Nebraska, Mech & Mat Engn, Lincoln, NE 68588 USA; 5.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China; 6.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R 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.