Effect of aging treatment on microstructures, tensile properties and intergranular corrosion behavior of Al–Cu–Li alloy

Lin, Yi; Lu, Change; Wei, Chengyang; Zheng, Zhoushun

doi:10.1016/j.matchar.2018.04.043

Cited by 73 publications

(20 citation statements)

References 32 publications

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“…intragranular pitting corrosion of the pre-strained samples [3,13]. The distance between the precipitates provided a good condition for corrosion diffusion.…”

Section: Discussionmentioning

confidence: 96%

“…During direct artificial aging treatment, solute atoms prefer to cluster on grain boundaries to decrease strain energy [13]. Therefore, in the A1 and A2 samples, a large number of coarse Cu-rich phases were continuously precipitated on HAGBs.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, in the A1 and A2 samples, a large number of coarse Cu-rich phases were continuously precipitated on HAGBs. Compared with HAGBs, LAGBs were generally composed of a series of dislocations, which are typically more likely to form T 1 precipitates in Al-Cu-Li alloys [8,13]. The rapid growth of precipitates on the grain boundaries consumes many nearby atoms, resulting in a PFZ of a certain width.…”

Section: Discussionmentioning

confidence: 99%

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Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Deng

Chen

2020

Materials

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The influences of aging treatments on microstructures and the corrosion properties of an Al–Cu–Li alloy were investigated through an immersion test in intergranular corrosion (IGC) solutions, a potentiodynamic polarization test, and electrochemical impedance spectra (EIS), combined with scanning and transmission electron microscopy. The results demonstrated that the Al–Cu–Li alloy displayed outstanding comprehensive mechanical properties and IGC resistance after treating with pre-strain deformation and a double aging process (PDA). Both the PDA and pre-strain followed by creep aging (PCA) treatments significantly increased the number densities of T1 and θ’ precipitates in the grain interior. The increase in precipitates in the grain interior greatly reduced the Cu-rich precipitates on the grain boundaries and inhibited the formation of a precipitate-free zone (PFZ). The electrochemical characteristics of the Al–Cu–Li alloy were influenced by the precipitates in the grain interior and grain boundaries. The studied alloy gained high IGC resistance due to the refinement of its microstructure, and the main corrosion mode was intra-granular pitting corrosion; thus, the corrosion diffusion rate was slowed down.

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“…intragranular pitting corrosion of the pre-strained samples [3,13]. The distance between the precipitates provided a good condition for corrosion diffusion.…”

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Deng

Chen

2020

Materials

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“…And the density of T1 precipitates in the 240CA and 160CA is beyond SFA at 15 hr. At the same time, Cu atoms which T1 precipitates contain may be kept in the matrix to form intragranular T1 phase and hindered to move to the grain boundary where T1 precipitates are reduced . Accordingly, the potential dissimilarity between the matrix and the grain boundary is homogenized at the creep aging time of 15 hr and the IGC vanishes.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, Li et al studied the exfoliation corrosion behavior of a novel Al–Li alloy treated by T6 and T8 peak aging and found that T8‐treated alloy has lower exfoliation susceptibility than T6‐treated one due to the larger amount and size of T1 phase and equilibrium precipitates at grain boundary of T6‐treated alloy. Lin et al found that the intergranular corrosion resistance of Al–Cu–Li alloy is improved under T8 single aging and T8 duplex aging treatment compared to T6 because dense distributed T1 phases in grain interior and discontinuous intergranular phases greatly reduced the difference of corrosion potential between matrix and grain boundaries. There are some researchers who have realized that the localized corrosion morphology could be changed with increasing time of aging.…”

Section: Introductionmentioning

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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Quantification of the Effect of Increased Pre‐Deformation on Microstructure and Mechanical Properties of 2A55 Al–Li Alloy

et al. 2022

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Effect of aging treatment on microstructures, tensile properties and intergranular corrosion behavior of Al–Cu–Li alloy

Cited by 73 publications

References 32 publications

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

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

Quantification of the Effect of Increased Pre‐Deformation on Microstructure and Mechanical Properties of 2A55 Al–Li Alloy

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