Modelling of anisotropy for Al-Li 2099 T83 extrusions and effect of precipitate density

Bois-Brochu, Alexandre; Blais, Carl; Goma, Franck Armel Tchitembo; Larouche, Daniel

doi:10.1016/j.msea.2016.07.081

Cited by 23 publications

(8 citation statements)

References 9 publications

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“…In contrast, Weld II exhibited a robust weld with a relatively small nugget zone, indicating sufficient heat input and appropriate stirring action that allowed for full plastic flow. The size of the weld nugget was inversely proportional to the transverse speed due to the linear heat input, as seen in other FSW aluminum alloys [1,2]. Figure 2c,d shows the stir zone in Weld I and Weld II.…”

Section: Grain Structurementioning

confidence: 65%

“…The AA2099 contains intermetallic particles that frequently contain low solubility elements, such as Fe, and are rich in Cu and Mn [1,41,42]. While both welds contain these intermetallic particles, Weld I had a much larger amount of these particles (Figure 2e,f).…”

Section: Grain Structurementioning

confidence: 99%

“…Aluminum-lithium (Al-Li) alloys are attractive lightweight alloys due to their lower density and higher strength compared to conventional aluminum alloys. Al-Li alloys offer enhanced fatigue crack growth resistance, greater specific strength, high fracture toughness, density reduction, stiffness increase, and superior corrosion resistance in comparison to traditional aerospace alloys [1,2]. Significant challenges arise when using 2xxx and 7xxx aluminum alloys during the joining and assembly methods.…”

Section: Introductionmentioning

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: Grain Structurementioning

confidence: 65%

Section: Grain Structurementioning

confidence: 99%

Section: Introductionmentioning

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 strength loss in the FSW joint is originated from the microstructure changing during welding. In present investigated alloy, T 1 and δ ′ are primary strengthening phases, and the strengthening effect of T 1 phase is higher than that of δ ′ phase . The dissolution of T 1 and δ ′ phases in the FSW process inevitably caused strength reduction.…”

Section: Resultsmentioning

confidence: 77%

Influences of Friction Stir Welding and Post‐Weld Heat Treatment on Al–Cu–Li Alloy

Lin

Wei

et al. 2017

Adv Eng Mater

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In this paper, the influences of friction stir welding (FSW) and post-weld heat treatment (PWHT) on the microstructures and tensile properties of Al-Cu-Li alloy are investigated. After FSW, strengthen loss occurred in the welding area. Remarkable softening occurs in the thermo-mechanically affected zone (TMAZ) resulting from dissolution of Al 3 Li (δ 0 ) phases. Recrystallization and precipitation of ultra-fine δ 0 phases take place in the nugget zone (NZ) that lightens the softening degree of this zone. A noteworthy enhancement in the hardness and tensile strength of the joint is achieved after T8 reaging treatment (3% À pre-deformation, 30 h at 152 C). However, re-solution treatment coupled with re-aging treatment leads to ductility deterioration in the joint because coplanar slip of coarse Al 3 Li phases induces severe stress concentration during plastic deformation.

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“…The high elastic modulus of Al-Li stands it out compared to traditional aluminum alloys. It is reported that elastic modulus of aluminum metal is increased by 6% while weight is decreased by 3% when it is alloyed with 1% lithium [3][4][5]. The simultaneous addition of copper and lithium improves the strength of the alloy [6].…”

mentioning

confidence: 99%

Analysis of the Fatigue Damage Behavior of AW2099-T83 Al-Li Alloy under Strain-Controlled Fatigue

Adinoyi¹,

Merah

Albinmousa

2019

Frattura Ed Integrità Strutturale

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Microstructural characteristics, monotonic and strain-controlled cyclic axial behaviors of AW2099-T83 Aluminum-Lithium alloy were investigated. Grain sizes and structures are not uniform in the different orientations studied. High strength and low ductility characterize the tensile behavior of the alloy under static loading. Strain-controlled fatigue testing was conducted at strain amplitudes ranging from 0.3% to 0.7%. Over this range, macro plastic deformation was only observed at 0.7%. Cyclic stress evolution was found to be dependent on both the applied strain amplitude and the number of cycles. Limited strain hardening was observed at low number of cycles, followed by softening, due probably to damage initiation. With low plastic strain, analytical approach was adopted to profile the damaging mechanism for the different applied strain amplitude. Because of the absence of fatigue ductility parameters due to low plasticity, a three-parameter equation was used to correlate fatigue life. Fractured specimens were studied under SEM to characterize the fracture surface and determine the controlling fracture mechanisms. The fractography analysis revealed that fracture at low strain amplitudes was shear controlled while multiple secondary cracks were observed at high strain amplitude. Intergranular failure was found to be the dominant crack propagation mode.

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Modelling of anisotropy for Al-Li 2099 T83 extrusions and effect of precipitate density

Cited by 23 publications

References 9 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

Influences of Friction Stir Welding and Post‐Weld Heat Treatment on Al–Cu–Li Alloy

Analysis of the Fatigue Damage Behavior of AW2099-T83 Al-Li Alloy under Strain-Controlled Fatigue

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