Correlation of intergranular corrosion behaviour with microstructure in Al-Cu-Li alloy

Huang, Jian; Li, Jinfeng; Liu, Danyang; Zhang, Ruifeng; Chen, Yong-lai; Zhang, Xu-hu; Ma, Peijun; Gupta, Rajeev; Birbilis, Nick

doi:10.1016/j.corsci.2018.05.011

Cited by 60 publications

(27 citation statements)

References 39 publications

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“…The phases, such as T 1 , as the main strengthening phase of Al-Li alloy, might strongly affect the corrosion performance of the alloy. Li et al [35] and Huang et al [36], both showed that T 1 was closely related to the generation of intergranular corrosion, and Su et al [46] confirmed the same outcomes. Luo et al [37] found that discontinuous localized corrosion in Al-Li alloy is associated with corroded θ′ (Al 2 Cu) particles, as well as pits that are formed by particle fall-out due to dissolution of surrounding Al substrate.…”

Section: Introductionmentioning

confidence: 84%

“…The microstructural characterization and mechanical properties of Al-Li alloy with FSW joints were studied by many researchers [32][33][34], however, the major concerns remained was about the corrosion behavior of the alloy. Li et al [35] and Huang et al [36] studied the intergranular corrosion behaviors of 2195 Al-Li alloy and found that the intergranular corrosion of the alloy was related to T 1 phase. Luo et al [37] and Li et al [38] studied the corrosion behaviors of Al-Li alloys in sodium chloride solution, they found that general corrosion and localized corrosion of intergranular and pitting corrosion in the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Baiyao

Zhang

Khoshnaw

2020

Mater. Res. Express

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This research aims to investigate the effect of the exfoliation corrosion exposure time on the mechanical properties, the strength and elongation, of friction stir welded Al-Li alloy type 2195-T8. The exfoliation corrosion test was performed using the exfoliation corrosion (EXCO) solution, based on ASTM G34. The samples were exposed to different exposure times 24,48, 96, 192 and 384 h. The results showed that both the strength and elongation of the welded specimens-exposed to the exfoliation corrosion tests-were reduced. For example, the samples that were exposed to 384 h, their initial tensile strength and elongation were reduced by 13% and 17% respectively. The degradation process due to the exfoliation corrosion on the tensile strength was divided into three stages: fast (0-96 h: 443.7 MPa-416.3 MPa, the degraded rate was 0.29 MPa/h), steady (96-192 h: 416.3 MPa-413.4 MPa, the degraded rate was 0.03 MPa h −1 ) and medium rate MPa, the degraded rate was 0.14 MPa h −1 ). For the elongation, in general, the reduction was similar to the style of strength, but with different rates. The TEM images showed that this degradation was due to the dissolution of T 1 (Al 2 CuLi) and S′ (Al 2 CuMg) phase. Also, the corrosion products and their role of adherence on the surface of the tested specimens were investigated. An empirical equation p-t (mechanical properties-exposure time) was established to calculate the effect of exposure corrosion time on the performance of welded specimens.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Baiyao

Zhang

Khoshnaw

2020

Mater. Res. Express

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“…The presence of T1 (Al2CuLi) precipitates in the grain and at grain boundary is considered as the critical factor to cause corrosion in Al–Li alloys . The potential of T1 precipitates in corrosion medium was reported to be about −1.076 Vsce and −1.096 Vsce which is more negative than the corrosion potential of aluminium matrix (−0.75 Vsce).…”

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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“…The most commonly used high strength cast aluminium alloys are based on the Al-Cu binary system (4.0-5.0 wt% Cu), such as A206 alloy, which is one of the strongest and toughest cast aluminium alloys [16,17]. The mechanical properties and corrosion resistance of aluminium alloys are dependent on the heat treatment process [18,19]. A206-T7 alloy has both higher tensile strength (436 MPa) and elongation (11.7%) [20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, corrosion behavior and mechanical properties of a non-isothermal ageing treated cast Al–4.5Cu–3.5Zn–0.5Mg alloy

Wang

Jiang

et al. 2020

Mater. Res. Express

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Al-Cu, being a high-strength aluminium alloy, is used to prepared castings which are widely used in the automotive and aerospace industries as lightweight parts. However, corrosion is an issue. The Al-Cu alloys show improved properties when other elements are added to them. One such alloy is Al-4.5Cu-3.5Zn-0.5Mg. In order to improve the corrosion resistance and strength of this Al-4.5Cu-3.5Zn-0.5Mg cast alloy, a novel non-isothermal ageing (NIA) treatment was developed that comprised a heating stage up to 250°C, followed by a cooling stage down to room temperature at the rate of 60°C·h −1 . Specimens were removed throughout the process and immediately quenched for morphological, mechanical, and electrochemical testing. The hardness continuously increased up to 124 HV with ageing time. The alloy exhibited optimal properties after ageing for~340 min (with the aging temperature reaching 130°C during the cooling stage of the NIA treatment), with a tensile strength and maximum corrosion depth of 395 MPa and 165 μm, respectively. Fine precipitates discontinuously appeared at the grain boundaries during the cooling stage. Some new fine Ω phases were precipitated in the grains, thereby narrowing the precipitation-free zone. Thus, high strength and good corrosion resistance of the alloy can be obtained via the NIA treatment. Notably, NIA treatments are less time-consuming than isothermal ageing treatments, thereby expanding the applications of high-strength cast aluminium alloys in the manufacturing industry.

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Correlation of intergranular corrosion behaviour with microstructure in Al-Cu-Li alloy

Cited by 60 publications

References 39 publications

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

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

Microstructure, corrosion behavior and mechanical properties of a non-isothermal ageing treated cast Al–4.5Cu–3.5Zn–0.5Mg alloy

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