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Defect formation, microstructure evolution, and mechanical properties of bobbin tool friction-stir welded 2219-T8 alloy
Wang, Z. L.1,2; Zhang, Z.1; Xue, P.1; Ni, D. R.1; Ma, Z. Y.1; Hao, Y. F.3; Zhao, Y. H.3; Wang, G. Q.4
Corresponding AuthorZhang, Z.(zhangzhen@imr.ac.cn) ; Ni, D. R.(drni@imr.ac.cn)
2022-01-14
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume832Pages:12
AbstractBobbin tool friction stir welding (BT-FSW) is a novel and effective welding method for aluminum alloys, but microvoid defects are usually formed in the nugget zones (NZ). Therefore, it is important to understand the formation mechanism of microvoid defects and their effect on the fracture behavior of joints. In the present study, 6 mm thick 2219-T8 aluminum alloy plates were subjected to BT-FSW under a constant rotation rate of 300 rpm and welding speeds of 150-500 mm min(-1) with the objective of analyzing the evolution of microvoid defects and their effect. The results showed that, lower welding speeds resulted in microvoid defects in the band pattern structure on the retreating side (RS) of the NZ, and the size of the defects decreased with increasing the welding speed, while sound joints were obtained under higher welding speeds. In contrast to conventional FSW precipitation-hardened aluminum alloys with the lowest hardness zone (LHZ) at the heat affected zone (HAZ), the LHZs of the BT-FSW 2219-T8 joints were located at the thermal-mechanically affected zone (TMAZ). Digital image correlation (DIC) of large tensile samples showed that the microvoid defects exhibited an obvious effect on the tensile deformation and fracture behavior of the joints due to the decrease in the maximum strain and lack of necking. Mini-samples in different layers further confirmed that cracks initiated from the microvoid defects in the NZ. However, the sound BT-FSW 2219-T8 joints fractured along the LHZs on the RS, with a maximum joint strength coefficient of 78.1% being achieved.
KeywordBobbin tool friction stir welding Defect Microstructure Digital image correlation Mini-sample Mechanical property
Funding OrganizationNational Science and Technology Major Project of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Prograrn
DOI10.1016/j.msea.2021.142414
Indexed BySCI
Language英语
Funding ProjectNational Science and Technology Major Project of China[2018ZX04013001-005] ; National Natural Science Foundation of China[U1760201] ; LiaoNing Revitalization Talents Prograrn[XLYC2002099]
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000729806900003
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167329
Collection中国科学院金属研究所
Corresponding AuthorZhang, Z.; Ni, D. R.
Affiliation1.Chinese Acad Sci, Shichangxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
3.Capital Aerosp Machinery Co, Beijing 100076, Peoples R China
4.China Acad Launch Vehicle Technol, Beijing 100076, Peoples R China
Recommended Citation
GB/T 7714
Wang, Z. L.,Zhang, Z.,Xue, P.,et al. Defect formation, microstructure evolution, and mechanical properties of bobbin tool friction-stir welded 2219-T8 alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,832:12.
APA Wang, Z. L..,Zhang, Z..,Xue, P..,Ni, D. R..,Ma, Z. Y..,...&Wang, G. Q..(2022).Defect formation, microstructure evolution, and mechanical properties of bobbin tool friction-stir welded 2219-T8 alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,832,12.
MLA Wang, Z. L.,et al."Defect formation, microstructure evolution, and mechanical properties of bobbin tool friction-stir welded 2219-T8 alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 832(2022):12.
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