Complex Precipitation Sequences of Al-Cu-Li-(Mg) Alloys Characterized in Relation to Thermal Ageing Processes

Gao, Zi; Chen, Jianghua; Duan, S.Y.; Yang, Xiaorong; Wu, C.L.

doi:10.1007/s40195-016-0366-5

Cited by 42 publications

(15 citation statements)

References 34 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: 77%

“…According to Gao et al [15], just prolonging the aging time at 200°C to 72h is sufficient to dissolve δ' and θ', while the T1 and S phases still remain stable.…”

Section: : Adf-stem Images Of the Precipitate Microstructure In (A)(mentioning

confidence: 99%

“…In agreement with [33], the cubic structured σ phase is usually observed in overaged Al-Cu-Mg alloys, and it corresponds to the stoichiometric formula Al5Cu6Mg2. It is however reported in literature [15,34] that cubic σ phase might also form in Al-Cu-Li alloys in different aging or overaging conditions. EDS maps were also performed on the most overaged sample, as reported in Fig.8, in order to combine chemical and morphological analyses and to clearly define the phases still present after overaging.…”

Section: : Adf-stem Images Of the Precipitate Microstructure In (A)(mentioning

confidence: 99%

“…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%

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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: 77%

“…According to Gao et al [15], just prolonging the aging time at 200°C to 72h is sufficient to dissolve δ' and θ', while the T1 and S phases still remain stable.…”

Section: : Adf-stem Images Of the Precipitate Microstructure In (A)(mentioning

confidence: 99%

Section: : Adf-stem Images Of the Precipitate Microstructure In (A)(mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…But usually, these particles formed during aging possess simple structure, and the diffusion coefficient of the constituents is high, such as Cu, Si, and Mg in the Al solution, and thus, these particles will be coarsened quickly even redissolved when they undergo another thermal history [24][25][26][27]. So, the particles of the Al-Cu-Mn phases and metastable θ phase precipitated during the solutionizing and aging courses, respectively, remarkably increase the YS and UTS at room temperature (Figure 10(a) and Table 2).…”

Section: Contribution To Tension Propertiesmentioning

confidence: 99%

Uneven Precipitation Behavior during the Solutionizing Course of Al‐Cu‐Mn Alloys and Their Contribution to High Temperature Strength

Chen

Liao

2018

Advances in Materials Science and Engineering

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e dispersoid precipitation behavior during the solutionizing and aging of Al-xwt.%Cu-1.0 wt.% Mn alloys (x � 2.0, 4.5, and 7.5) and contribution to mechanical properties were investigated using tensile testing and microstructural characterization. A shell-core structure of primary α-Al dendrites is found in Al-Cu-Mn alloys, in which the Cu content in the shell is higher than that in the core. e area of shell zone (Cu-rich) increases with an increase in Cu content in the alloy. Large amounts of fine dispersoid Al-Cu-Mn particles precipitate in solution. An alloy with low Cu content results in only the T Mn (Al 20 Cu 2 Mn 3 ) particles being precipitated. However, in an alloy with high Cu content, AlCu 3 Mn 2 particles are first found to precipitate beside T Mn . However, this precipitation behavior is uneven. e precipitation zones in the solution microstructure are consistent with the Cu-rich regions in the as-cast microstructure. A number of fine particles (dozens nanometer in size) are first found to precipitate on the rod-like T Mn particles during the aging phase. e redissolution and granulation of the eutectic CuAl 2 phase during the solutionizing process result in the formation of particle-free bands between the precipitation zones. e tension test at 300°C demonstrates that the increase in high temperature strength is due to the dispersoid precipitation during solutionizing, and the precipitation behavior in the aging phase has little or no effect, however, largely improves the tensile strength at room temperature. High temperature strength is significantly increased with an increase in Cu content, which correlates to an increase in number and decrease in size of T Mn and AlCu 3 Mn 2 particles.

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Microstructure and Mechanical Properties of the As‐Cast AlLiCuMgZr Alloy with High Li Content and Different Cu/Mg Ratios

Qian

et al. 2020

Adv Eng Mater

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Complex Precipitation Sequences of Al-Cu-Li-(Mg) Alloys Characterized in Relation to Thermal Ageing Processes

Cited by 42 publications

References 34 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

Uneven Precipitation Behavior during the Solutionizing Course of Al‐Cu‐Mn Alloys and Their Contribution to High Temperature Strength

Microstructure and Mechanical Properties of the As‐Cast AlLiCuMgZr Alloy with High Li Content and Different Cu/Mg Ratios

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