Survey of Candidate Aluminum Materials for Supersonic Aircraft Applications

Spuhler, E. H.; Knoll, Aaron; Stickley, G. W.

doi:10.4271/630407

Cited by 2 publications

(2 citation statements)

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“…Lithium provides precipitation strengthening to aluminum alloys by a homogenous distribution of coherent, spherical δ' (Al 3 Li). Equilibrium phase δ (AlLi) forms mainly at grain boundaries [23] and can lead to void nucleation and intergranular fracture [24]. With small additions of zirconium, precipitation of β' is possible.…”

Section: Al-cu-li-x Alloys (2000 Series Al-li Alloys)mentioning

confidence: 99%

Aluminum Lithium Alloys (Al-Li-Cu-X)-New Generation Material for Aerospace Applications

Ahmed

2013

AMM

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Significant advantages in weight reduction and increased strength have place advanced aluminum-lithium alloys at forefront of aerospace materials research. These alloys are being developed to fulfill the ever increasing need for high strength, high properties, light weight and cost effective for aerospace industry. Conventional aluminum alloys has long been in service for aerospace application. The addition of lithium to aluminum improves modulus and decrease density compared to conventional aluminum alloys. Atomic weight of lithium is 7 mass units compared to aluminum 23 mass units, hence there is density reduction of about 3% for each weight percent addition of lithium and about 6% increase in Youngs modulus. In principle weight saving for aerospace structural parts could reach up to 15 %. This paper examines effect of lithium addition on properties, physical metallurgy; various phases developed during processing of these alloys. The addition of Lithium to aluminum form coherent, low density Al3Li (δ׳) precipitates. However the binary alloys have poor mechanical properties which are attributed to strain localization and shearing of soft Al3Li (δ׳) precipitates. This problem has been solved by development of ternary and quaternary alloys containing copper and magnesium. In all aluminum-lithium alloys, small addition of zirconium or scandium is done to improve recrystallization. The new developed aluminum lithium alloys series Al-Li-Cu-X are potential candidate to replace existing conventional alloys in terms of enhanced properties with reduced density.

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Section: Al-cu-li-x Alloys (2000 Series Al-li Alloys)mentioning

confidence: 99%

Aluminum Lithium Alloys (Al-Li-Cu-X)-New Generation Material for Aerospace Applications

Ahmed

2013

AMM

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“…The development of Al-Li based alloys dates back to 1920 s when the first patent on the use of lithium in aluminium alloys was issued. 4 2020 alloy (Al-4?5Cu-1?1Li-0?5Mn-0?2Cd) developed by Alcoa in the 1960s 3,5 is one of the earliest Al-Li based alloys. The work of Fridlyander et al resulted in the development of the lighter 01420 Al-Li-Mg alloy in 1969.…”

Section: Introductionmentioning

confidence: 99%

Crystallographic defects induced localised corrosion in AA2099-T8 aluminium alloy

Zhou

Huang

et al. 2014

Corrosion Engineering, Science and Technology

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A correlation has been revealed between the localised corrosion susceptibility and the grain stored energy in AA2099-T8 aluminium alloy, with grains of higher stored energy being relatively more susceptible to corrosion attack. The grains of high stored energy contain increased crystallographic defects, which could consequently decrease their corrosion resistance. Additionally, since crystallographic defects are preferential sites for the precipitation of T 1 (Al 2 CuLi) phase, it is suggested that grains of high stored energy could also contain increased volume fraction of T 1 phase after aging, which might further increase corrosion susceptibility due to the electrochemically high activity of lithium rich T 1 phase.

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Survey of Candidate Aluminum Materials for Supersonic Aircraft Applications

Cited by 2 publications

References 1 publication

Aluminum Lithium Alloys (Al-Li-Cu-X)-New Generation Material for Aerospace Applications

Aluminum Lithium Alloys (Al-Li-Cu-X)-New Generation Material for Aerospace Applications

Crystallographic defects induced localised corrosion in AA2099-T8 aluminium alloy

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