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In-situ investigation on the deformation mechanism of duplex microstructure of a near alpha titanium alloy
Jia, Runchen1,2,3; Zeng, Weidong1,2,3; Zhao, Zibo4; Zhang, Penghui1,2,3; Xu, Jianwei1,2,3; Wang, Qingjiang4
Corresponding AuthorZeng, Weidong(zengwd@nwpu.edu.cn) ; Zhao, Zibo(zbzhao@imr.ac.cn)
2022-02-10
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume893Pages:15
AbstractThe targeted research of equiaxed alpha particles and lamellar alpha colonies in duplex microstructure of Ti60 alloy was conducted to more reveal the related mechanisms. For this purpose, in-situ tensile test, the electron probe microanalysis (EPMA), microhardness test, electron backscatter diffraction (EBSD), and Transmission Electron Microscopy (TEM) technologies were used to carry out relevant research in this work. The in-situ tensile result shows that the slip line preferentially occurs in the equiaxed alpha particle. Prism slip of the (10 (1) over bar0) plane and [1 (2) over bar 10] direction is the most activated slip system in the equiaxed alpha particle according to the calculation result of the movement slip system. Single slip was operated in individual equiaxed alpha particle, as the stress concentration at the grain boundary increases, multiple slips could be activated in the adjacent equiaxed alpha particle while the slip line was hardly found in colonies. With the deformation amount increases, pyramidal slip mode with high critical resolved shear stress (CRSS) in lamellar alpha had to be activated to accommodate the deformation. It is concluded from the in-situ tensile observation and EBSD analysis that the lamellar microstructure contributes less to the deformation at room temperature which is attributed to the large size of colonies and limited range of slip systems. Cracks nucleate mainly at the grain boundary of the equiaxed alpha particle and the colony since the existence of non-deformation area. TEM analysis shows that the dislocation networks were pinning by the silicide at the grain boundary of the equiaxed alpha particle, thus induces the stress concentration and promotes the crack nucleation. In addition, the blocking effect of the alpha(2)-Ti3Al particles on the dislocation was also found, indicating that the microcrack could nucleate within the equiaxed alpha particle. On this basis, two diverse crack initial modes of intergranular fracture at the grain boundary and transgranular with in the equiaxed alpha particle fracture were proposed. (C) 2021 Elsevier B.V. All rights reserved.
KeywordIn-situ tensile Electron probe micro analysis Transmission electron microscopy Deformation mechanism Slip systems Dislocation networks
Funding OrganizationNational Major Science and Technology Project ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi province of China ; Aeronautical Science Foundation of China
DOI10.1016/j.jallcom.2021.162184
Indexed BySCI
Language英语
Funding ProjectNational Major Science and Technology Project[J2019-VI-0005-0119] ; National Natural Science Foundation of China[51905436] ; Natural Science Foundation of Shaanxi province of China[2020JQ-156] ; Aeronautical Science Foundation of China[201911053001]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000711197400004
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167120
Collection中国科学院金属研究所
Corresponding AuthorZeng, Weidong; Zhao, Zibo
Affiliation1.Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
2.Northwestern Polytech Univ, Def Technol Innovat Ctr Precis Forging & Ring Rol, Sch Mat Sci & Engn, Xian 710072, Peoples R China
3.Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming T, Xian 710072, Peoples R China
4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Jia, Runchen,Zeng, Weidong,Zhao, Zibo,et al. In-situ investigation on the deformation mechanism of duplex microstructure of a near alpha titanium alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,893:15.
APA Jia, Runchen,Zeng, Weidong,Zhao, Zibo,Zhang, Penghui,Xu, Jianwei,&Wang, Qingjiang.(2022).In-situ investigation on the deformation mechanism of duplex microstructure of a near alpha titanium alloy.JOURNAL OF ALLOYS AND COMPOUNDS,893,15.
MLA Jia, Runchen,et al."In-situ investigation on the deformation mechanism of duplex microstructure of a near alpha titanium alloy".JOURNAL OF ALLOYS AND COMPOUNDS 893(2022):15.
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