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Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint
Jia, C. L.1,2; Wu, L. H.1,3; Xue, P.1,3; Zhang, H.1,3; Ni, D. R.1; Xiao, B. L.1; Ma, Z. Y.1
Corresponding AuthorWu, L. H.(lhwu@imr.ac.cn)
2022-08-20
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume119Pages:1-10
AbstractThe spheroidization of the lamellar structure can greatly contribute to the superplasticity of the nugget zone (NZ) of Ti alloy welds, which is the key to achieve the integral superplastic forming of welds for the fabrication of large-scale complex components. However, the spheroidization process is complex and costly since it cannot be obtained generally, unless the lamellae suffers from a large deformation. In this study, the static spheroidization was achieved for the fine lamellae structure in the nugget of a friction stir welded (FSW) Ti-6Al-4V joint, particularly by the annealing without any deformation. The special alpha/beta interface obeying a Burgers orientation relationship (BOR) after FSW was first time directly observed, whose effect on the spheroidization was discussed. A new static spheroidization mechanism with the gradual coalescence of the adjacent lamellae was discovered, which we named as "termination coalescence". There was a slower coarsening rate in the lamellar structure than in the classical equiaxed one, due to the BOR in the lamellae, although both of them exhibited a volume diffusion character during annealing. Consequently, the similar superplasticity can be achieved for the base material and NZ after annealing. This study can provide a new way to the spheroidization and a theoretical basis for the integral superplastic forming of welds during production. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordFriction stir welding Titanium alloys Spheroidization mechanism Coalescence Superplasticity Static annealing
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences Youth Innovation Promotion Association ; Liaoning Provincial Natural Science Foundation ; Liaoning Revitalization Talents Program
DOI10.1016/j.jmst.2021.10.054
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51601194] ; National Natural Science Foundation of China[51471171] ; National Natural Science Foundation of China[U1760201] ; Chinese Academy of Sciences Youth Innovation Promotion Association[2021193] ; Liaoning Provincial Natural Science Foundation[2021-YQ-01] ; Liaoning Revitalization Talents Program[XLYC2002099]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000788187900001
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/172555
Collection中国科学院金属研究所
Corresponding AuthorWu, L. H.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Jia, C. L.,Wu, L. H.,Xue, P.,et al. Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,119:1-10.
APA Jia, C. L..,Wu, L. H..,Xue, P..,Zhang, H..,Ni, D. R..,...&Ma, Z. Y..(2022).Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,119,1-10.
MLA Jia, C. L.,et al."Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 119(2022):1-10.
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