The Effect of Thermal Exposure on the Mechanical Properties of 2099-T6 Die Forgings, 2099-T83 Extrusions, 7075-T7651 Plate, 7085-T7452 Die Forgings, 7085-T7651 Plate, and 2397-T87 Plate Aluminum Alloys

Jabra, J.; Romios, M.; Lai, Jiamei; lee, E.; Setiawan, M.; Lee, E. W.; Witters, J.; Abourialy, N.; Ogren, J.; Clark, Russell A.; Oppenheim, Tomas; Frazier, William E.; Es‐Said, O.S.

doi:10.1361/105994906x136142

Cited by 52 publications

(26 citation statements)

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“…The actual residual Brinell hardness values were therefore taken into account in order to model the behaviour of the 2099 alloy with residual hardness. As expected, a well-defined relationship exists between tensile properties and residual hardness, as also reported by Jabra et al [24]. In particular, as shown in Fig.9a, UTS and Rp0.2 exhibit an exponential decrease in the overaged alloy, while At% shows a logarithmic increase with prolonged overaging.…”

Section: Tensile Testssupporting

confidence: 87%

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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: Tensile Testssupporting

confidence: 87%

“…Jabra et al [24] firstly evaluated the response of AA2099 to prolonged thermal exposure at elevated temperatures (180°C, 230°C, 290°C), in order to replicate a range of possible thermal environments. For all the investigated temperatures, a decrease of tensile properties was found, coupled with an increase of the elongation to failure.…”

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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“…However, there is still an interest in developing the next generation of Al-Li alloy with improved specific strength and damage tolerance and reduced mechanical property anisotropy [1]. This interest stemmed from the fact that each 1 % lithium added to the alloy reduced its density by 3 % and increased the elastic modulus by *5 % [2,3]. A representative third-generation Al-Li alloy is the AF/C 458 alloy, which was developed in 1997 and designated as AA 2099 by the Aluminum Association in 2004 [4].…”

Section: Introductionmentioning

confidence: 99%

Homogenization heat treatment of 2099 Al–Li alloy

et al. 2013

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The microstructure evolution and composition distribution of as-cast and homogenized 2099 aluminumlithium (Al-Li) alloy were studied by optical microscopy (OM), differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), area and line scanning, X-ray diffraction (XRD), and Vickers microhardness test methods. The results show that severe dendrite exists in the as-cast alloy. Cu, Zn, Mn, and Mg distribute unevenly from the grain boundary to inside. The low-melting point nonequilibrium eutectic phases dissolve into the matrix during the first-step homogenization, whereas the melting point of residual eutectic phases is elevated. After the second-step homogenization, most of the remaining eutectic phases dissolve into the matrix, except a small amount of Al-Cu-Fe phases. An optimized homogenization process of the 2099 Al-Li alloy is developed (515°C 9 18 h ? 525°C 9 16 h), which shows a good agreement with the homogenization kinetic analysis results.

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“…The trends observed can be attributed to the essential completion of sintering reactions at approximately 20 min. Shorter times did not allow for all reactions to transpire, while longer times are believed to have encouraged detrimental grain growth and precipitate coarsening [14], which can also explain the greater elongation at 50 min. …”

Section: Effects Of Sintering Timementioning

confidence: 99%