Microstructure and Precipitate Characteristics of Aluminum–Lithium Alloys

Prasad, K. Satya; Prasad, N. Eswara; Gokhale, A.M.

doi:10.1016/b978-0-12-401698-9.00004-5

Cited by 43 publications

(51 citation statements)

References 65 publications

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“…It is a special issue for the Al‐Cu‐Li alloys, which were developed with the aim of weight reduction to replace the conventional Al‐Cu alloys largely used in the aircraft industry. These alloys are also associated with increased elasticity modulus . But, because of lithium addition, they are highly susceptible to localized corrosion, mainly to a type known as severe localized corrosion (SLC) with peculiar characteristics, such as hydrogen evolution and fast penetration through the thickness of the alloy, named, SLC.…”

Section: Introductionmentioning

confidence: 99%

“…These alloys are also associated with increased elasticity modulus. 5 But, because of lithium addition, they are highly susceptible to localized corrosion, mainly to a type known as severe localized corrosion (SLC) with peculiar characteristics, such as hydrogen evolution and fast penetration through the thickness of the alloy, named, SLC. This high susceptibility to localized corrosion has been associated with T1 phase (Al 2 CuLi) in Al-Cu-Li alloys, which is preferentially located in regions of high-dislocation density because of intense deformation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Machado

Klumpp

Ayusso

et al. 2019

Surface & Interface Analysis

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In this work, the effect of eight types of surface treatments on the corrosion resistance of friction stir welded samples of an AA2198‐T8 Al‐Cu‐Li alloy were tested and compared in an attempt to find suitable alternatives to toxic and carcinogenic hexavalent chromium treatments. All the samples were anodized and subjected to different post‐anodizing treatments. The post‐anodizing treatments were (1) hydrothermal treatment in Ce (NO3)3 6H2O solution; (2) hydrothermal treatment in Ce (NO3)3 6H2O solution with H2O2; (3) hydrothermal treatment in boiling water; (4) hexavalent chromium conversion coating; and (5) immersion in BTSE (bis‐1,2‐(triethoxysilyl) ethane. The corrosion resistance of the treated samples was evaluated by immersion tests in sodium chloride solution (0.1 mol L−1 NaCl) and electrochemical impedance spectroscopy (EIS) of the friction stir weldment. The results showed that among the alternative treatments, the Ce‐containing solutions presented the best corrosion resistance, especially when used without peroxide.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Machado

Klumpp

Ayusso

et al. 2019

Surface & Interface Analysis

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“…T1 phase is the reported to be the major strengthening phase in aged Al–Cu–Li . T1 precipitates are possible to nucleate at dislocations, grain boundaries, vacancies or clusters of vacancies, and Al3Zr dispersoids . The high stress of 240 MPa is greater than the yield strength of the material after the heating process to 153℃ and induces plastic deformation.…”

Section: Discussionmentioning

confidence: 99%

The effect of creep aging on localized corrosion resistance of AA2060 alloy

Wang

Zhan

Liu

et al. 2019

Materials & Corrosion

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The influence of creep aging at varied stresses on the localized corrosion behavior of AA2060 has been studied in this paper. Samples were subjected to stress free aging (SFA) and creep aging (CA) under two stress levels, after which tensile tests and intergranular corrosion (IGC) tests were carried out. The corrosion morphology and depth were examined using optical microscope. Compared with SFA, CA can enhance the mechanical properties and increase the IGC resistance of Al–Cu–Li alloy but high‐stress CA would intensify the intragranular corrosion penetration in the first 25 hr of aging time. The microstructure observation results show that dislocations introduced by CA provide favorable nucleation sites for T1 precipitates in the grain and impede the growth of T1 precipitates at grain boundary. Therefore, the potential difference between the grain interior and grain boundary can be reduced compared to that for the SFA. The mechanism by which CA affects the corrosion resistance of Al–Cu–Li alloys, as is essential to understand and optimize the creep aging process, has been proposed by considering the effect of creep‐deformation‐induced dislocations.

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“…[76][77][78][79][80] However, studies progressively reported the inhibitive character of Li when exposed to Al, particularly in alkaline environments. [81][82][83] It was suggested that Li was readily intercalated into the Al hydroxide matrix, 84,85 hence stabilizing the passive film when exposed to an aggressive environment.…”

Section: Lithium-containing Coatingsmentioning

confidence: 99%

Chromate replacement: what does the future hold?

Gharbi

Thomas

Smith³

et al. 2018

npj Mater Degrad

157

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The ubiquitous use of chromium and its derivatives as corrosion preventative compounds accelerated rapidly after the second industrial revolution, with such compounds now integral to modern society. However, the detrimental impact of chromium compounds on the environment and human health has prompted the need to revisit the majority of current industrial corrosion protection measures. This review retraces the origins of chromium replacement motivations, introducing the various legislative actions aimed at diminishing the use of chromium compounds, and critically reviews alternative corrosion preventative technologies developed in the recent decades to now. The review, herein, is intended for a broad audience in order to provide a concise update to an increasingly timely issue.

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Microstructure and Precipitate Characteristics of Aluminum–Lithium Alloys

Cited by 43 publications

References 65 publications

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

The effect of creep aging on localized corrosion resistance of AA2060 alloy

Chromate replacement: what does the future hold?

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