The Interface Between δ′ and Matrix in an 8090 Al-Li Alloy Studies by SAXS

Chai, Zhinan; Xu, Yuxin; Meng, Fanling

doi:10.1016/s1044-5803(98)00047-3

Cited by 8 publications

(7 citation statements)

References 11 publications

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“…This deviation from the predictions of the above equations is thought to result from their reduced effectiveness as obstacles as a result of their diffuse interface [14] and other structural imperfections [22] † . We will model strength for this condition assuming that the strengthening effect of δ' phase in the room temperature aged condition is effectively zero.…”

Section: Strengthening Due To δ'mentioning

confidence: 96%

“…(endothermic), ii) dissolution of very fine δ' precipitates that become unstable on increase of temperature (endothermic), iii) further ordering of L1 2 ordered domains (exothermic) iv) changes in the initially diffuse interface layer between δ' and the matrix [14] leading to a sharper interface (exothermic) v) coarsening of δ' (exothermic), vi) dissolution of GPB zones/clusters (endothermic).…”

Section: Analysis Of the Microstructures Of 8090 Sheetmentioning

confidence: 99%

“…To calculate the volume fractions of GPB zones and δ' phase from the DSC curves, a procedure adopted before [13,14] has been employed. For this calculation, first the total heat effect per unit volume of sample, ΔQ d , of the combined dissolution of GPB and δ' in the range 50 to 260ºC is calculated from the DSC graphs.…”

Section: Quantitative Analysis and Model For Strengtheningmentioning

confidence: 99%

“…where ΔH GPB and ΔH δ' are the heats of formation (per unit volume of phase formed) and f GPB and f δ' the volume fractions of GPB zones and δ' phase, respectively [14].…”

Section: Quantitative Analysis and Model For Strengtheningmentioning

confidence: 99%

See 3 more Smart Citations

Embrittlement of Al–Li–Cu–Mg alloys at slightly elevated temperatures: microstructural mechanisms of hardening

Starink

Hobson

Sinclair

et al. 2000

Materials Science and Engineering: A

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When underaged, damage tolerant Al-Li based alloys are exposed to slightly elevated temperatures (60 to 100ºC), their strength increases and toughness decreases. To study the first stages of this process, 8090 sheet in three underaged heat treatment conditions, including T3, T81 and a multistage temper, was exposed for 1000 h at 70°C. Using a model for strengthening in combination with a quantitative analysis of differential scanning calorimetry data, it is shown that strengthening can be explained by an increase in the volume fraction of the δ' phase and, to a lesser extent, to the formation of Guinier-Preston (GPB) zones. For the T3 temper, coarsening of δ' precipitates is the main strengthening mechanism during exposure at 70ºC. The solvus of δ' and GPB, which to a large extent defines this embrittlement, is discussed. Toughness reduction during exposure at slightly elevated temperatures can be minimised via a multi stage temper or via a reduction of the Li content of the alloy.

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Section: Strengthening Due To δ'mentioning

confidence: 96%

Section: Analysis Of the Microstructures Of 8090 Sheetmentioning

confidence: 99%

Section: Quantitative Analysis and Model For Strengtheningmentioning

confidence: 99%

“…where ΔH GPB and ΔH δ' are the heats of formation (per unit volume of phase formed) and f GPB and f δ' the volume fractions of GPB zones and δ' phase, respectively [14].…”

Section: Quantitative Analysis and Model For Strengtheningmentioning

confidence: 99%

See 2 more Smart Citations

Embrittlement of Al–Li–Cu–Mg alloys at slightly elevated temperatures: microstructural mechanisms of hardening

Starink

Hobson

Sinclair

et al. 2000

Materials Science and Engineering: A

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“…Mukhopadhyay et al [4] have reported that the relative stability of T 2 (Al 6 CuLi 3 ) and other Al-Li-Cu-Mg phase (C phase) was affected by Cu:Mg and Cu:Li ratio. Although a number of researches have been conducted to investigate various precipitates formed in Al-Li-Cu-Mg alloys [5][6][7], quite a few questions still remain as to the evolution of the precipitates and the resultant mechanical behaviors. Especially, the effect of extra-additions of Mg to 8090 base alloys on the microstructure and mechanical properties has not been clearly understood.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characteristics and mechanical properties of Al–2.5wt.% Li–1.2wt.% Cu–xMg alloys

Kim¹,

Seong²,

Jun³

et al. 2007

Journal of Alloys and Compounds

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Bibliography

2014

Aluminum-Lithium Alloys

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Evaluation of corrosion behaviour of AlÀMgÀLi alloys in sea water. J. Mater. Eng. Perform. 5, 235À240. Ahmadi, S., Arabi, H., Shokuhfar, A., 2010. Effects of multiple strengthening treatments on mechanical properties and stability of nanoscale precipitated phases in an alumi-numÀcopperÀlithium alloy. J. Mater. Sci. Technol. 26, 1078À1082. Ahmed, M., 1987, Correlation between aging heat treatments, microstructure and stress corrosion properties of AlÀLiÀCuÀMg alloys.

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The Interface Between δ′ and Matrix in an 8090 Al-Li Alloy Studies by SAXS

Cited by 8 publications

References 11 publications

Embrittlement of Al–Li–Cu–Mg alloys at slightly elevated temperatures: microstructural mechanisms of hardening

Embrittlement of Al–Li–Cu–Mg alloys at slightly elevated temperatures: microstructural mechanisms of hardening

Microstructural characteristics and mechanical properties of Al–2.5wt.% Li–1.2wt.% Cu–xMg alloys

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