Effect of ageing treatments on the precipitation behavior and mechanical properties of Al–Cu–Li alloys

Xu, Jian; Deng, Yunlai; Chen, Jiqiang; Xie, Yuankang; Guo, Xiping

doi:10.1016/j.msea.2019.138885

Cited by 50 publications

(14 citation statements)

References 26 publications

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“…The T 1 phase was easily enriched and precipitated on LAGBs. According to previous research [8], neither number density nor the average diameter of the T 1 precipitate on the LAGB of pre-strained samples (PA, PCA, PDA) was less than those of direct artificially aged samples (A1, A2). In addition, the number density of T 1 precipitates in the grain interior increased in the order of A1, A2, PA, PCA, and PDA, while the average diameter decreased gradually.…”

Section: Eis Measurementsmentioning

confidence: 69%

“…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%

“…After solution heat treatment at 510 • C for 1 h followed by water quenching, all samples were separated into five groups. The different aging treatment procedures and the comprehensive mechanical properties of the studied alloy are given in our previous publications [8], and the relevant measurements are given in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…The specimen was polished with 10% HClO 4 and 90% C 2 H 5 OH solution at 20 V, and then the EBSD photographs were obtained by the same scanning electron microscope equipped with an OXFORD EBSD detector. For the preparation procedures for the transmission electron microscopy (TEM) samples and the method of observing transmission in microstructure, refer to previous publications [8].…”

Section: Microstructure Characterizationmentioning

confidence: 99%

“…The number density of T 1 phases is significantly increased by plastic deformation treatment before direct artificial aging. The high density of T 1 precipitates has an effective pinning effect on dislocations, improving strength and toughness [7,8]. However, previous work [9,10] has indicated that the electrochemical potential of T 1 precipitates differs from that of the matrix, leading to an increase in corrosion susceptibility for Al-Cu-Li alloys.…”

Section: Introductionmentioning

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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Section: Eis Measurementsmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Microstructure Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

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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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 Precipitation Strengthening Phase and Mechanical Properties of Al–Cu–Li Alloy

Zhang,

Zhong,

Qian

et al. 2023

Adv Eng Mater

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The microstructure and mechanical properties of Al‐Cu‐Li alloy with different aging processes have been investigated. The experimental results indicate that increasing aging temperature enhances the precipitation kinetics of the alloy, which is beneficial for T1 phase precipitation. The average size of δ′ phase is decreased from 18.2 nm to 11.6 nm when aging process changes from 200°C single‐stage aging to 150°C/200°C two‐stage aging. The two‐stage aging can effectively suppress the coarsening of δ′ phase because T1 phase competes with δ' phase for Li atoms. The past researches have pointed out that T1 phase thickens when aging temperature exceeds 190°C. However, the results indicate that two‐stage aging can not only retard thickening but also increase number density of T1 phase. The alloy reaches maximum strength in two‐stage aging, and the ultimate tensile strength (UTS), yield strength (YS) and elongation (EL) is 415 MPa, 376 MPa, 5.9%, respectively. When the diameter of T1 phase reaches a critical value, the strengthening mechanism of T1 phase has changed from shear mechanism to bypass mechanism. The diameter distribution range of T1 phase is large in this paper, and the strengthening mechanism of T1 phase is a mixed strengthening mechanism of shear mechanism and bypass mechanism.This article is protected by copyright. All rights reserved.

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Effect of ageing treatments on the precipitation behavior and mechanical properties of Al–Cu–Li alloys

Cited by 50 publications

References 26 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

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

Effect of Aging Treatment on Precipitation Strengthening Phase and Mechanical Properties of Al–Cu–Li Alloy

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