Intergranular corrosion of an Al-Cu-Li alloy: The influence from grain structure

Wang, Xiaoya; Li, Guoai; He, Qiyao; Jiang, Jian-Tang; Li, Dongfeng; Shao, Wen‐Zhu; Zhen, Liang

doi:10.1016/j.corsci.2022.110845

Cited by 17 publications

(9 citation statements)

References 41 publications

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“…The first category includes μm scale IMPs that are considered constituent particles and dispersoid particles which form during solidification and thermo-mechanical processing, respectively. 60,61 Those examined here include Al 37 Cu 2 Fe 12 , Al 65 Cu 20 Fe 15 , Y-AlMnCu, and Al 3 (FeMnCu). The second category includes nm scale precipitates that typically form during aging.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Characteristics of Intermetallic Phases in Al–Cu–Li Alloys

Zhu

Frankel

Miller

et al. 2023

J. Electrochem. Soc.

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This study provides a comprehensive overview of the electrochemical characteristics of intermetallic compounds (IMCs) commonly encountered in the 3rd generation Al-Cu-Li alloys. The electrochemical measurements were carried out on a AA2070-T8 alloy and surrogate alloys that have the compositions of select IMCs, typically found in AA2070-T8. The effects of environmental variables such as [Cl-] and pH on the corrosion potential, pitting potential, repassivation potential, corrosion rate, and galvanic current of these IMCs were thoroughly evaluated utilizing the electrochemical microcell method. An electrochemical database was documented that covers eight groups of common IMCs in various Al alloys. The findings improve the understanding of interactions between matrix and IMCs in Al alloys, with implications for corrosion mitigation and new materials design.

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Section: Resultsmentioning

confidence: 99%

“…The second category includes nm scale precipitates that typically form during aging. 60,61 Those examined here include Al 3 Cu 2 , Al 7.5 Cu 4 Li (T B ), Al 6 CuLi 3 (T 2 ), Al 2 CuLi (T 1 ), and Al 3 Li (δ ′).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Characteristics of Intermetallic Phases in Al–Cu–Li Alloys

Zhu

Frankel

Miller

et al. 2023

J. Electrochem. Soc.

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“…BCC1 is Fe-, Cr-rich, BCC2 is Al-, Ni-rich, and Si exists in the system as a solid solution. Due to the potential difference between grain boundaries and intergranular regions with different chemical compositions during the electrolyte solution corrosion process, the coating will experience galvanic corrosion effects during the electrochemical corrosion process 18 . The grain boundaries of the coating is enriched in Al, Ni, and Cu elements, and the grains are enriched in Fe and Cr elements.…”

Section: Corrosion Behavior Of Coatings and Substratesmentioning

confidence: 99%

Corrosion Behavior of As-Cladding Al0.8CrFeCoNiCu0.5Six High Entropy Alloys in 3.5% NaCl Solution

Li,

Shi,

Lin

et al. 2024

Mat. Res.

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The corrosion behavior of Al 0.8 CrFeCoNiCu 0.5 Si x (x=0, 0.2, 0.3) high-entropy alloy laser cladding coatings in a 3.5% NaCl solution was investigated using polarization tests, impedance spectroscopy, scanning electron microscopy, and energy dispersive spectroscopy. As the Si content increased, the over-passivation potential and the width of the passivation zone for the Al 0.8 CrFeCoNiCu 0.5 Six coating expanded, while the corrosion current density tended to decrease, enhancing the stability of the passivation film and the corrosion resistance of the coating. The Al 0.8 CrFeCoNiCu 0.5 coating underwent selective corrosion, with some pitting corrosion distribution showing no apparent regularity. The Al 0.8 CrFeCoNiCu 0.5 Si 0.2 coating exhibited a distinct grain profile with a tendency towards intergranular corrosion. The aggregation of Cu-rich and Al-Ni intergranular phases in the eutectic structure led to preferential erosion at the grain boundaries by corrosion ions in the Al 0.8 CrFeCoNiCu 0.5 Si 0.2 coating. The Al 0.8 CrFeCoNiCu 0.5 Si 0.3 coating presented corrosion pits, although their distribution did not display apparent regularity. The Al 0.8 CrFeCoNiCu 0.5 Si x high-entropy alloy coating demonstrates superior corrosion resistance in solution compared to 5083 aluminum alloy.

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“…For instance, T 1 volume fraction, length and thickening have all been found to be influenced by aging time and temperature in conventionally manufactured alloys [4,6,8]. Similarly, different conventionally heat-treated Al-Cu-Li alloys have been reported to have different corrosion responses [17][18][19][20][21][22]. These findings indicate that the corrosion behavior of the alloy is as a result of the presence of different types of precipitates in the microstructure.…”

Section: Introductionmentioning

confidence: 97%

Preheating Influence on the Precipitation Microstructure, Mechanical and Corrosive Properties of Additively Built Al–Cu–Li Alloy Contrasted with Conventional (T83) Alloy

et al. 2023

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In this paper, the high strength and lightweight Al–Cu–Li alloy (AA2099) is considered in as-built and preheated conditions (440 °C, 460 °C, 480 °C, 500 °C, and 520 °C). The purpose of this study is to investigate the influence of laser powder bed fusion (LPBF) in situ preheating on precipitation microstructure, mechanical and corrosive properties of LPBF-printed AA2099 alloy compared to the conventionally processed and heat-treated (T83) alloy. It is shown that precipitations evolve with increasing preheating temperatures from predominantly globular Cu-rich phases at lower temperatures (as-built, 440 °C) to more plate and rod-like precipitates (460 °C, 480 °C, 500 °C and 520 °C). Attendant increase with increasing preheating temperatures are the amount of low melting Cu-rich phases and precipitation-free zones (PFZ). Hardness of preheated LPBF samples peaks at 480 °C (93.6 HV0.1), and declines afterwards, although inferior to the T83 alloy (168.6 HV0.1). Preheated sample (500 °C) shows superior elongation (14.1%) compared to the T83 (11.3%) but falls short in tensile and yield strength properties. Potentiodynamic polarization results also show that increasing preheating temperature increases the corrosion current density (Icorr) and corrosion rate. Indicated by the lower oxide resistance (Rox), the Cu-rich phases compromise the integrity of the oxide layer.

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Intergranular corrosion of an Al-Cu-Li alloy: The influence from grain structure

Cited by 17 publications

References 41 publications

Electrochemical Characteristics of Intermetallic Phases in Al–Cu–Li Alloys

Electrochemical Characteristics of Intermetallic Phases in Al–Cu–Li Alloys

Corrosion Behavior of As-Cladding Al0.8CrFeCoNiCu0.5Six High Entropy Alloys in 3.5% NaCl Solution

Preheating Influence on the Precipitation Microstructure, Mechanical and Corrosive Properties of Additively Built Al–Cu–Li Alloy Contrasted with Conventional (T83) Alloy

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