Design of Multistep Aging Treatments of 2099 (C458) Al-Li Alloy

Romios, M.; Tiraschi, R.; Parrish, Catherine; Babel, H. W.; Ogren, J.; Es‐Said, O.S.

doi:10.1361/105994905x64594

Cited by 52 publications

(32 citation statements)

References 4 publications

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“…Ortiz et al [22] confirmed that tensile properties remain substantially stable up to 1000h of exposure at 83°C and 135°C, while a relevant decrease of strength is detected when the alloy is exposed to 177°C, up to 1000h; the same observation is supported by Romios et al [23] and Gao et al [15], who considered the soaking at 180°C responsible for overaging.…”

Section: Interval (±2σ) (A) Overaging Curves In the Range Of Interesmentioning

confidence: 75%

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Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

Balducci

Ceschini

Messieri³

et al. 2017

Materials & Design

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Highlights• Lightweight AA2099(Al-Cu-Li) exhibits a thermal stability comparable or even higher than other Al-Cu alloys specifically developed for high temperature applications.• Overaged AA2099 showed high residual hardness and tensile strength, suggesting its potential use in high temperature (yet lighter) automotive components.• STEM investigations revealed the superior thermal stability of the T1 phase (typical of AlCu-Li alloys) compared to ϑ and S. AbstractThe thermal stability of the lightweight, T83 heat treated 2099 Al-Cu-Li alloy was assessed in the temperature range 200-305°C, through both hardness and tensile tests. After prolonged overaging, the alloy exhibited a better performance compared to aluminium alloys specifically developed for high temperature applications, with the advantage of a considerable lower density. The tensile behaviour was modelled through Hollomon's equation as a function of residual hardness. The changes in the alloy performance were explained through both SEM and STEM investigations. 2Microstructural analyses gave evidence of Ostwald ripening, while fractographic analyses revealed a transition from an intergranular to a ductile fracture mechanism in the overaged alloy. STEM investigations highlighted the superior thermal stability of the T1 phase compared to ϑ and S strengthening phases, which dissolved during overaging at 245°C. The study underlines the need to enhance the formation of T1 precipitates when high temperature strength is required. The results of the present study suggest that the 2099 alloy is a very promising candidate for automotive engine components, which are extremely demanding in terms of both thermal resistance and lightweight. Graphical abstract KeywordsAl-Cu-Li alloy; Thermal effect; Hardness test; Tensile test; Microstructure; STEM.

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Section: Interval (±2σ) (A) Overaging Curves In the Range Of Interesmentioning

confidence: 75%

“…Very few studies, whose aim is mainly linked to the design of the aging treatment, deal with thermal exposure of AA2099 at medium-high temperature (that is below 200°C), but little attention has been given to microstructural features [15,20,22,23].…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

Balducci

Ceschini

Messieri³

et al. 2017

Materials & Design

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“…The best RRA processes were at 200°C for any time (5,10,20,40, and 60 min). This is true for both processes 1 and 2.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Retrogression and Reaging on Aluminum Alloy 2099 (C458)

Ward

Tran

Abad

et al. 2010

J. of Materi Eng and Perform

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The objective of this study was to investigate the feasibility of performing retrogression and reaging (RRA) heat treatments on 2099 aluminum-lithium alloy. The retrogression temperatures were 200-250°C and retrogression times were 5-60 min. Half of the samples were exposed to a salt fog environment. Interestingly, the samples exposed to salt spray had consistently higher mechanical tensile properties than those which were not exposed.

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“…[1][2][3] Like most of aerospace aluminium alloys, the AA2099 alloy needs surface finishing by anodizing to provide the required corrosion resistance under service conditions. Previous work [4,5] on anodizing behaviour of an AA2099-T8 alloy suggested that coarse intermetallic particles in the alloy significantly influenced the film formation at local sites, resulting in morphological and/or compositional discontinuities in the resultant anodic film.…”

Section: Introductionmentioning

confidence: 99%

Microstructural origin of localized corrosion in anodized AA2099‐T8 aluminium–lithium alloy

Xiao-li

Zhou

et al. 2015

Surface & Interface Analysis

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aThe microstructural origin of localized corrosion in AA2099-T8 aluminium-lithium alloy after tartaric-sulfuric acid anodizing and sulfuric acid anodizing has been investigated. It is suggested that the high-copper-containing constituent Al-Fe-Mn-Cu particles are responsible for the initiation of localized corrosion in the anodized alloy. Once the anodic film at the defects associated with the high-copper-containing particles has been penetrated by the corrosive media, localized corrosion may further propagate in the alloy substrate, and the propagation is controlled by the alloy microstructure immediately beneath the anodic film at the initiation site.

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Design of Multistep Aging Treatments of 2099 (C458) Al-Li Alloy

Cited by 52 publications

References 4 publications

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

The Effects of Retrogression and Reaging on Aluminum Alloy 2099 (C458)

Microstructural origin of localized corrosion in anodized AA2099‐T8 aluminium–lithium alloy

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