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Friction stir welding of 2060-T8 Al-Li alloy. Part I: Microstructure evolution mechanism and mechanical properties
Tao, Y.; Zhang, Z.; Yu, B. H.; Xue, P.; Ni, D. R.; Xiao, B. L.; Ma, Z. Y.
Corresponding AuthorZhang, Z.(zhangzhen@imr.ac.cn) ; Ma, Z. Y.(zyma@imr.ac.cn)
2020-10-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume168Pages:13
Abstract2 mm thick rolled 2060-T8 Al-Li alloy plates were subjected to friction stir welding (FSW) under rotation rates of 400-1200 rpm and welding speeds of 50-200 mm/min. In the nugget zone (NZ), FSW resulted in the dissolution of the precipitates and the formation of delta ' (Al3Zr) precipitates, as well as the formation of Guinier-Preston (GP) and Guinier-Preston-Bagaryatsky (GPB) zones except for at 400 rpm-200 mm/min. In the heat affected zone (HAZ), FSW led to the dissolution and coarsening of T1 (Al2CuLi) and S ' (Al2CuMg), and the subsequent formation of new theta ' (Al2Cu) and sigma (Al5Cu6Mg2) precipitates. The lowest hardness zones (LHZs) of the FSW joints were located at either the NZ or the HAZ under varied welding parameters. Different from the FSW joints of conventional precipitation-hardened aluminum alloys, the ultimate tensile strength of FSW 2060-T8 joints increased as the rotation rate increased from 400 to 800 rpm, but was unchanged with further increasing the rotation rate from 800 to 1200 rpm under a constant welding speed of 200 mm/min. On the other hand, the joint strength increased as the welding speed increased from 50 to 200 mm/min under a constant rotation rate of 1200 rpm. While the FSW joints fractured at the LHZs under 400 rpm-200 mm/min and 1200 rpm-50 mm/min, abnormal fracture at the thermo-mechanically affected zone (TMAZ) was observed under 800 rpm-200 mm/min and 1200 rpm-200 mm/min.
KeywordFriction stir welding Aluminum-Lithium alloys Precipitates Hardness Strength Fracture
Funding OrganizationNational Natural Science Foundation of China
DOI10.1016/j.matchar.2020.110524
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[U1760201]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000571497800009
PublisherELSEVIER SCIENCE INC
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/140658
Collection中国科学院金属研究所
Corresponding AuthorZhang, Z.; Ma, Z. Y.
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Tao, Y.,Zhang, Z.,Yu, B. H.,et al. Friction stir welding of 2060-T8 Al-Li alloy. Part I: Microstructure evolution mechanism and mechanical properties[J]. MATERIALS CHARACTERIZATION,2020,168:13.
APA Tao, Y..,Zhang, Z..,Yu, B. H..,Xue, P..,Ni, D. R..,...&Ma, Z. Y..(2020).Friction stir welding of 2060-T8 Al-Li alloy. Part I: Microstructure evolution mechanism and mechanical properties.MATERIALS CHARACTERIZATION,168,13.
MLA Tao, Y.,et al."Friction stir welding of 2060-T8 Al-Li alloy. Part I: Microstructure evolution mechanism and mechanical properties".MATERIALS CHARACTERIZATION 168(2020):13.
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