On the microstructure characterization of the AA2098-T351 alloy welded by FSW

Milagre, Mariana Xavier; Mogili, Vishnu; Donatus, Uyime; Giorjão, Rafael Arthur Reghine; Terada, Maysa; Araujo, João Victor S.; Machado, Caruline S.C.; Costa, Isolda

doi:10.1016/j.matchar.2018.04.015

Cited by 68 publications

(38 citation statements)

References 54 publications

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“…On the other hand, both δ′ and β′ phases have low electrochemical activity, i.e. high corrosion potential, but they were both the strengthening phases of Al-Li alloy [23,34]. Therefore, during the corrosion process, the joint performance did not show a completely linear relationship with the corrosion, see Figure 6, due to the consumption of T 1 and S′.…”

Section: Discussionmentioning

confidence: 99%

“…The precipitates in the BM primarily consist of T 1 (Al 2 CuLi) and θ´(Al 2 Cu) phases [11,14,15], while in HAZ the phases are δ′ (Al 3 Li) [14,[16][17][18][19], while there are reports show S′ (Al 2 CuMg) phase in HAZ [10,[20][21][22]. In terms of WNZ, which is affected by both thermomechanical and stirring, both δ′ and β′ (Al 3 Zr) are the major strengthening phases [14,16,23,24]. Due to these microstructural changes, many researchers have studied the corrosion performance of welded alloys [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Baiyao

Zhang

Khoshnaw

2020

Mater. Res. Express

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This research aims to investigate the effect of the exfoliation corrosion exposure time on the mechanical properties, the strength and elongation, of friction stir welded Al-Li alloy type 2195-T8. The exfoliation corrosion test was performed using the exfoliation corrosion (EXCO) solution, based on ASTM G34. The samples were exposed to different exposure times 24,48, 96, 192 and 384 h. The results showed that both the strength and elongation of the welded specimens-exposed to the exfoliation corrosion tests-were reduced. For example, the samples that were exposed to 384 h, their initial tensile strength and elongation were reduced by 13% and 17% respectively. The degradation process due to the exfoliation corrosion on the tensile strength was divided into three stages: fast (0-96 h: 443.7 MPa-416.3 MPa, the degraded rate was 0.29 MPa/h), steady (96-192 h: 416.3 MPa-413.4 MPa, the degraded rate was 0.03 MPa h −1 ) and medium rate MPa, the degraded rate was 0.14 MPa h −1 ). For the elongation, in general, the reduction was similar to the style of strength, but with different rates. The TEM images showed that this degradation was due to the dissolution of T 1 (Al 2 CuLi) and S′ (Al 2 CuMg) phase. Also, the corrosion products and their role of adherence on the surface of the tested specimens were investigated. An empirical equation p-t (mechanical properties-exposure time) was established to calculate the effect of exposure corrosion time on the performance of welded specimens.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Baiyao

Zhang

Khoshnaw

2020

Mater. Res. Express

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“…These welding processes have been successfully applied to join dissimilar aluminum alloys [7][8][9][10][11][12][13]. In the literatures, investigators have paid more attention to study the effect of FSW parameters on microstructures, mechanical properties, and defects formation [7,9,[11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Researchers found that FSW parameters, such as tool design, tool rotation and traverse speed, depth of tool plunge, angle of tool tilt, tool pin offset, and welding gap, etc., may lead to defect formation, if they are not selected properly [8,25,26].…”

Section: Of 15mentioning

confidence: 99%

The Influence of Pre- and Post-Heat Treatment on Mechanical Properties and Microstructures in Friction Stir Welding of Dissimilar Age-Hardenable Aluminum Alloys

Yang

Lin

Liu

et al. 2019

Metals

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An Al-Mg-Si alloy 6061 and an Al-Zn-Mg alloy 7A52 were joined by friction stir welding successfully. Pre- and post- heat treatment were employed to improve the strength of the weld. The results show a best weld joint with the lowest hardness of 100 HV in 6061 matrix, being achieved by post-solid-solution and subsequent two-stage artificial aging for the whole weld joint of the 7A52 and 6061 solid solution. Under this condition, the weld nugget zone (WNZ) is stronger than 6061 matrix but it has lower hardness than 7A52 matrix. The hardness of WNZ is contributed by the combination of η′ and L precipitates, dynamically changes along with the ratios between the number of η′ and L precipitates. The higher the number density of η′ precipitates, the hardness of WNZ is closer to that of the 7A52 matrix. Otherwise, the higher number density of L precipitates, the hardness of WNZ is closer to that of 6061 matrix. The coexistence of η′ and L precipitates is a direct result from the mixture of 7A52 and 6061 alloys achieved by stirring. Precipitates identification and composition analysis reveal a dynamic WNZ with constituent transition in hardness and composition.

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“…A research focused on welding of Al-Li alloys is a focus of research institutions worldwide. Friction stir welding counts to the joining methods being investigated [13][14][15][16][17]. Investigations are oriented also on welding of aluminium lithium alloys with the use of a filer material.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Properties of Aw2099 Aluminium-Lithium Alloy Welded by Laser Beam With Aw5087 Aluminium-Magnesium Filler Material

2019

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EN AW2099 aluminium lithium alloy, 2.0mm in thickness, was used as an experimental material. EN AW2099 belongs to the 3rd generation of aluminium lithium alloys. The third generation was developed to improve the disadvantages of the previous generation, such as anisotropy in mechanical properties, low fracture toughness, corrosion resistance and resistance to fatigue crack growth, as well. Aluminium magnesium 5087 filler wire with a diameter of 1.2mm was used for the welding. Crack free weld joints were produced after an optimization of welding parameters. The microstructure of weld metal and mechanical properties of weld joints were investigated. Equiaxed zone (EQZ) was observed at the fusion boundary. The character of grains changed in the direction towards the weld centre, from the columnar dendrite zone to equiaxed dendrite zone in the weld centre. The microstructure of the weld metal matrix consisted of -aluminium. Alloying elements enrichment was found at the inter-dendritic areas, namely copper and magnesium. The microhardness decrease in the weld metal due to a dissolution of strengthening precipitates was measured. The microhardness was slightly higher in comparison to a weld produced by a laser welding without a filler material. The tensile strength of the weld joint reached around 67% of the base material’s strength and the fracture occurred in the weld metal.

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On the microstructure characterization of the AA2098-T351 alloy welded by FSW

Cited by 68 publications

References 54 publications

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

The Influence of Pre- and Post-Heat Treatment on Mechanical Properties and Microstructures in Friction Stir Welding of Dissimilar Age-Hardenable Aluminum Alloys

Analysis of the Properties of Aw2099 Aluminium-Lithium Alloy Welded by Laser Beam With Aw5087 Aluminium-Magnesium Filler Material

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