Twinning and sequential kinking in lamellar Ti-6Al-4V alloy
Zheng, Xiaodong; Zheng, Shijian; Wang, Jian; Ma, Yingjie; Wang, Hao; Zhou, Yangtao; Shao, Xiaohong; Zhang, Bo; Lei, Jiafeng; Yang, Rui; Ma, Xiuliang
Source PublicationACTA MATERIALIA
AbstractFully lamellar Ti-6Al-4V alloys comprise body-centered cubic (BCC) beta lamellae in large-sized, hexagonal close-packed (HCP) alpha colonies and exhibit outstanding toughness. Although alpha/beta 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, {1 (1) over bar 02} deformation twins were observed in the vicinity of fatigue crack surfaces. Moreover, the alpha/beta interface structures before and after cyclic loading deformation were characterized via transmission electron microscopy(TEM). The initial alpha/beta interfaces can be described by the terrace ledge kink model, consisting of (01 (1) over bar0)(alpha)parallel to((1) over bar 21)(beta) terrace plane and ((1) over bar 100)(alpha)parallel to((1) over bar 01)(beta) ledge plane. TEM investigations reveal that deformation twins nucleate at the alpha/beta interface and the corresponding nucleation is ascribed to the dissociation of basal type dislocations. More importantly, these twins can continuously propagate through multiple beta phase lamella. The continuous propagation of twinning is accomplished through double kinking mechanism. In this manner, twinning in alpha phases and sequential kinking in beta 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordTi-6Al-4V twinning kinking interface toughness
Indexed BySCI
WOS IDWOS:000498749300041
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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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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