Friction Stir Welding Process of Aluminum-lithium Alloy 2195

Lee, Ho-Sung; Yoo, Joon-Tae; No, Kookil

doi:10.1016/j.proeng.2016.06.639

Cited by 37 publications

(17 citation statements)

References 5 publications

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“…The heat input from FSW caused the dissolution of the δ' precipitates, resulting in the reduction of strength observed in the welds. The coarsening and dissolution of strengthening precipitates is commonly seen in other FSW Al-Li alloys [21,25,44]. Figure 5 shows the experimental monotonic stress-strain curves for the BM AA2099 and the FSW AA2099 produced at 400 rpm and 100 mm/min and the FSW AA2099 produced at 700 rpm and 500 mm/min.…”

Section: Microhardnessmentioning

confidence: 90%

“…Friction stir welding technology has successfully shown the ability to join multiple materials, including high-strength aluminum alloys not capable of being joined through conventional welding [8][9][10][11][12][13][14][15][16]. Although aluminum-lithium alloys have shown some success in electron beam welding [17], laser beam welding [18], and fiber laser welding [19], FSW has exhibited better microstructural and mechanical properties without the inefficiencies seen with other welding techniques [20][21][22][23].While the mechanical properties [24][25][26][27][28] and fatigue life [20,29,30] of FSW Al-Li alloys have been quantified in limited studies, a lack of information exists concerning the fatigue behavior of aluminum lithium 2099 (AA2099) joined via FSW. As such, to best of the authors' knowledge, this is first study to investigate the structure-property-fatigue performance relationship of FSW of AA2099.…”

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confidence: 99%

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confidence: 99%

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Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Cisko

Jordon

Avery

et al. 2019

Metals

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An extensive experimental and computational investigation of the fatigue behavior of friction stir welding (FSW) of aluminum–lithium alloy (AA2099) is presented. In this study, friction stir butt welds were created by joining AA2099 using two different welding parameter sets. After FSW, microstructure characterization was carried out using microhardness testing, scanning electron microscopy, and transmission electron microscopy techniques. In particular, the metastable strengthening precipitates T1 (Al2CuLi) and δ’(Al3Li) seen in the base metal were observed to coarsen and dissolve due to the FSW process. In order to evaluate the static and fatigue behavior of the FSW of the AA2099, monotonic tensile and fully-reversed strain-controlled fatigue testing were performed. Mechanical testing of the FSW specimens found a decrease in the ultimate tensile strength and fatigue life compared to the base metal. While the process parameters had an effect on the monotonic properties, no significant difference was observed in the number of cycles to failure between the FSW parameters explored in this study. Furthermore, post-mortem fractography analysis of the FSW specimens displayed crack deflection, transgranular fracture, and delamination failure features commonly observed in other parent Al–Li alloys. Lastly, a microstructurally-sensitive fatigue model was used to elucidate the influence of the FSW process on fatigue life based on variations in grain size, microhardness, and particle size in the AA2099 FSW.

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Section: Microhardnessmentioning

confidence: 90%

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confidence: 99%

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confidence: 99%

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Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Cisko

Jordon

Avery

et al. 2019

Metals

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“…The most important of them are the tool rotation speed and travel speed. The goal of the present study is to discuss the effect of these two parameters on mechanical properties of joints, basing on the data derived from the literature [14,15].…”

Section: Friction Stir Weldingmentioning

confidence: 99%

Effect of Selected Friction Stir Welding Parameters on Mechanical Properties of Joints

Kossakowski

Wciślik

Bakalarz

2019

Archives of Civil Engineering

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The article discusses the basic issues related to the technology of friction stir welding (FSW). A short description of technology is provided. The following section provides the analysis of effect of technological parameters (tool rotation and welding speed) on the mechanical properties of the prepared joint (strength, ductility, microhardness). In both cases the analysis refers to aluminum alloys (6056 and AA2195-T0). The comparative analysis showed the phenomenon of the increase in weld strength along with the increase in the rotational speed of the tool during welding. Similarly, with the increase in welding speed, an increase in weld strength was observed. Some exceptions have been observed from the above relations, as described in the article. In addition, examples of material hardness distribution in the joint are presented, indicating their lack of symmetry, caused by the rotational movement of the tool. The analyses were performed basing on the literature data.

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“…Aluminium lithium alloys are a promising material from the above mentioned point of view [1]. The application of aluminium lithium alloys is advantageous due to low density, high specific strength, high Young's modulus and increased corrosion resistance [2][3][4][5][6][7][8]. It is known that the addition of 1 wt.…”

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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Friction Stir Welding Process of Aluminum-lithium Alloy 2195

Cited by 37 publications

References 5 publications

Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Effect of Selected Friction Stir Welding Parameters on Mechanical Properties of Joints

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

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