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Sinyavskii, V. S.; Semenov, A. M.

doi:10.1023/a:1014913031867

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Intergranular corrosion (IGC) is a main form of localized corrosion in these alloys, and IGC can transition into intergranular SCC (IGSCC) under a tensile stress [13,14]. Tensile stress increases the penetration rate of IGC by an amount that depends on the orientation of the stress relative to the wrought microstructure [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effects of compressive stress on localized corrosion in AA2024-T3

2006

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The effect of compressive stress on intergranular corrosion (IGC) of AA2024-T3 was studied using a constant load and simultaneous electrochemical measurement. A specially designed electrochemical cell was used to compress a pillar-shaped sample and control the potential at a value that promoted IGC. The extent of IGC was assessed by metallurgical cross-sectional images. The effect of the compressive stress depended on the orientation of the stress relative to the elongated microstructure. Application of a compressive stress halfway to yield in the S or through-thickness direction significantly reduced the growth kinetics of IGC in the longitudinal direction, but did not eliminate it totally. The strain change during exposure also was used to quantify the change in radius of the cylindrical sample as a function of time during IGC growth. The effect of compression on reducing IGC was also assessed by the current density measured during potentiodynamic and potentiostatic polarization. The effects of residual compressive stress on IGC were studied using samples treated by low plastic burnishing (LPB), which produces a surface layer with high residual compressive stress. The results depended on the plane of the LPB treatment. A micro-capillary cell was used to measure corrosion behavior at different zones of the section of an LPB-treated sample. The breakdown potential was significantly higher in the zone with residual compressive stress than in the interior of the sample.

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Section: Introductionmentioning

confidence: 99%

Effects of compressive stress on localized corrosion in AA2024-T3

2006

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“…The SCC process includes crack initiation and growth. The mechanism of crack growth involves either anodic dissolution or hydrogen embrittlement [15][16][17][18][19]. The grain boundary region is often the site of SCC because it can be preferentially susceptible to dissolution and is an easy ingress path for atomic hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Effect of applied tensile stress on intergranular corrosion of AA2024-T3

et al. 2004

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The effect of uniaxial tensile stress on intergranular corrosion (IGC) of AA2024-T3 was studied using the foil penetration technique. Standard ASTM G49 fixed-displacement jigs were modified to allow the use of sheet samples, which were then attached to an electrochemical cell as in the foil penetration setup. The time for IGC to penetrate samples of varying thickness was monitored. This method provides a new approach to bridge the gap between IGC and intergranular stress corrosion cracking (IGSCC). Samples with various orientations relative to the rolling direction were studied in 1.0 M NaCl at controlled anodic potentials. Potentiodynamic polarization measurements indicated that the two breakdown potentials typically observed for AA2024-T3 were lower for stressed samples than for unstressed samples, and the current at a given potential was higher. The penetration rate depended on potential and was higher for stressed samples than for unstressed samples. The primary form of attack above the higher breakdown potential was IGSCC, whereas pitting dominated between the two breakdown potentials. Stress had a larger effect on penetration rate at higher applied potentials, indicating that pitting is less susceptible to the effects of stress than a properly oriented IGC crevice. The effects of stress on the penetration rates in various orientations were strongly linked to the anisotropic microstructure. X-ray microfocal radiography and optical microscopy of cross-sections were used to characterize IGSCC defects in thin penetrated foils. In certain orientations, crack faces were parallel rather than perpendicular to the stress direction as a result of the constraints of the microstructure on the orientation of the IGC. Implications for the mechanisms of IGC and IGSCC are discussed.

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“…The alternate anodic dissolution of the T 1 phase and PFZ triggers the IGC or inter-subgranular corrosion (ISGC) [29,30]. Additionally, the selective dissolution of lithium elements was possibly the primary cause of the initial corrosion of the Al-Cu-Li alloy [31]. Other factors, such as the difference between the pitting initiation potential and the passivation potential, were also a vital cause of corrosion [32].…”

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confidence: 99%

Cu/Li Ratio on the Microstructure Evolution and Corrosion Behaviors of Al–xCu–yLi–Mg Alloys

Liu

Lin

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The microstructure evolution and the corrosion feature of Al-xCu-yLi-Mg alloys (x:y = 0.44, 1.65 and 4.2) were systematically investigated under the same artificial aging conditions. The relationships between types of precipitates and mechanical performance, as well as electrochemical behaviors, were discussed. Our results show that different types of precipitates can be obtained in alloys with different Cu/Li mass ratios, which significantly influences the mechanical performance of the alloys and substantial corrosion behaviors. Specifically, the analogous corrosion evolution in the aging Al-xCu-yLi-Mg alloys was first ascertained to be derived from the growth mechanism of the precipitates at the grain boundary (GB). Moreover, a small number of GB precipitates can be obtained in the aged alloy with the lowest Cu/Li mass ratio, thereby resulting in the largest intergranular corrosion resistance. A higher proportion of the GB T 1 phase in the continuous precipitates induces higher corrosion sensitivity in alloy with a high Cu/Li mass ratio.

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Cited by 5 publications

References 8 publications

Effects of compressive stress on localized corrosion in AA2024-T3

Effects of compressive stress on localized corrosion in AA2024-T3

Effect of applied tensile stress on intergranular corrosion of AA2024-T3

Cu/Li Ratio on the Microstructure Evolution and Corrosion Behaviors of Al–xCu–yLi–Mg Alloys

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