The effects of prolonged thermal exposure on the mechanical properties and fracture toughness of C458 aluminum–lithium alloy

Ortiz, Daniel R.; Brown, J. H.; Abdelshehid, M.; DeLeon, P.; Dalton, R.; Méndez, Laura; Soltero, J. F. A.; Pereira, M. V.; Hahn, M.; Lee, Eui; Ogren, J.; Clark, Russell A.; Foyos, J.; Es‐Said, O.S.

doi:10.1016/j.engfailanal.2004.10.008

Cited by 35 publications

(12 citation statements)

References 3 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 Interessupporting

confidence: 73%

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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 Interessupporting

confidence: 73%

“…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 Al-Li-Cu-Zr alloy, C458−T861 (Al−1.8Li−2.7Cu−0.3Mg−0.08Zr−0.3Mn−0.6Zn wt.%), destined for use in space vehicles, tested at 83, 135, and 177 • C for up to 1000 h showed good thermal stability of mechanical properties up to 135 • C. However, further increasing the temperature and time led to a reduction in the alloy fracture toughness [67].…”

Section: Thermal Stability Of Amorphous Alloys (Metallic Glasses)mentioning

confidence: 99%

Thermal Stability of Aluminum Alloys

Czerwiński

2020

Materials

115

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Thermal stability, determining the material ability of retaining its properties at required temperatures over extended service time, is becoming the next frontier for aluminum alloys. Its improvement would substantially expand their range of structural applications, especially in automotive and aerospace industries. This report explains the fundamentals of thermal stability; definitions, the properties involved; and the deterioration indicators during thermal/thermomechanical exposures, including an impact of accidental fire, and testing techniques. For individual classes of alloys, efforts aimed at identifying factors stabilizing their microstructure at service temperatures are described. Particular attention is paid to attempts of increasing the current upper service limit of high-temperature grades. In addition to alloying aluminum with a variety of elements to create the thermally stable microstructure, in particular, transition and rare-earth metals, parallel efforts are explored through applying novel routes of alloy processing, such as rapid solidification, powder metallurgy and additive manufacturing, engineering alloys in a liquid state prior to casting, and post-casting treatments. The goal is to overcome the present barriers and to develop novel aluminum alloys with superior properties that are stable across the temperature and time space, required by modern designs.

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“…So far the lower exposure temperatures in the range of 343 K to 358 K (70 °C to 85 °C) have been chosen to simulate the environment to which the wings and fuselage structures of commercial aircraft are exposed [5]. Reports have also been made on thermal exposure of Al–Cu–Li alloys at medium-high-temperatures (below 200 °C) [6,7]. However, materials near the engine, like bulkheads, are usually exposed to high-temperature environments (>200 °C).…”

Section: Introductionmentioning

confidence: 99%

Enhanced High-Temperature Mechanical Properties of Al–Cu–Li Alloy through T1 Coarsening Inhibition and Ce-Containing Intermetallic Refinement

Zhao²,

Shi³

et al. 2019

Materials

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The effects of the addition of 0.29 wt% Ce on the high-temperature mechanical properties of an Al–Cu–Li alloy were investigated. Ce addition contributes to T1 (Al2CuLi) phase coarsening inhibition and Ce-containing intermetallic refinement which greatly improved the thermal stability and high-temperature deformation uniformity of this alloy. On the one hand, small Ce in solid solution and segregation at phase interface can effectively prevent the diffusion and convergence of the main element Cu on T1 phase during thermal exposure. Therefore, the thermal stability of Ce-containing alloy substantiality improves during thermal exposure at the medium-high-temperature stage (170 °C to 270 °C). On the other hand, the increment of the tensile elongation in Ce-containing alloy is much greater than that in Ce-free alloy at high temperatures tensile test, because the refined Al8Cu4Ce intermetallic phase with high-temperature stability are mainly located in the fracture area with plastic fracture characteristics. This work provides a new method for enhancing high-temperature mechanical properties of Al–Cu–Li alloy which could be used as a construction material for high-temperature structural components.

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The effects of prolonged thermal exposure on the mechanical properties and fracture toughness of C458 aluminum–lithium alloy

Cited by 35 publications

References 3 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

Thermal Stability of Aluminum Alloys

Enhanced High-Temperature Mechanical Properties of Al–Cu–Li Alloy through T1 Coarsening Inhibition and Ce-Containing Intermetallic Refinement

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