Interrelation of TEM microstructure, composition, tensile properties, and corrosion resistance of Al-Cu-Mg-Mn alloys

Robinson, D. L.; Hunter, M. S.

doi:10.1007/bf02642446

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…Estas partículas possuem potenciais diferentes da matriz formando células galvânicas localizadas (LIAO et al, 1998;WEI et al, 1998 Hollingsworth (1987) A localização da passagem anódica nas ligas da série 2xxx está uma faixa estreita, pobre em Cu, de cada lado do contorno de grão, diferentemente das ligas da série 7xxx sem cobre, onde ela se localiza nos constituintes anódicos de Zn e Mg nos contornos de grão (ROBINSON;HUNTER, 1972). Galvele e Micheli (1970) mostraram que a zona pobre em Cu ao longo do contorno de grão é responsável pela corrosão intergranular em uma liga Al-Cu.…”

Section: Outros Fatores De Corrosão Em Ligas De Alunclassified

Estudo do efeito do ambiente no comportamento em fadiga de novas ligas 'AL' de grau aeronáutico

Gamboni¹

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Lithium-containing aluminum alloys are known to be attractive materials because of their low densities, high elastic modulus, high strengths and good corrosion resistance. Material degradation due to fatigue and corrosion are two major factors that contribute to the aging of an aircraft, and the prediction of corrosion and corrosion-fatigue are very important for the structural integrity of aircrafts. The presence of corrosion pits can significantly shorten the fatigue crack initiation life and decrease the threshold stress intensity of an alloy by as much as 50%. The purpose of this work was to compare mechanical, fatigue and electrochemical behavior of the new Al alloys, 2198 T851 and 7081 T73511 that are on the market, with those used by EMBRAER, named 2525 T3 and 7050 T7451. The comparisons also considered fatigue resistance in pre-corrosion confining in salt environment. Therefore, air and 15-day-confined 5% salt environment specimens were submitted to crack nucleation tests to obtain S-N curves. Potentiodynamic polarization curves were also plotted to study the electrochemical behavior of this alloys in a corrosion environment. Tensile and hardness tests were performed. The obtained results for the 2XXX series showed that these alloys are less susceptible to pitting corrosion due to more positives E pite compared to 7XXX series. However, their j corr values are also more positive, increasing the corrosion speed once it has begun. This happens due to the presence of some precipitates and a few elements that react in a way to increase the potential to higher values. Optical and electronic microscopy analyses were performed to determine the nature of precipitates of each alloy. The fatigue behavior of the salty-pre-confined environment specimens was much inferior compared to air test specimens according to each corrosion environment. Pits work as tension concentration, increasing fatigue crack nucleation. Air fatigue resistance of the new alloys was slightly inferior than the base alloys, but when the tests under preconfined environment were conducted, the four curves overlapped. This implies that the pit action governs crack nucleation mechanism, while in air, surface finishing is an additional factor.

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Section: Outros Fatores De Corrosão Em Ligas De Alunclassified

Estudo do efeito do ambiente no comportamento em fadiga de novas ligas 'AL' de grau aeronáutico

Gamboni¹

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“…Series 6xxx, the Al-Mg-Si system, is commonly used for high-stress applications, transport applications, bridges and cranes, the paper industry, and the petrochemical industry due to its high strength-to-weight ratio, good formability, and favorable corrosion resistance [14][15][16][17][18]. In particular, the corrosion resistance of Al-Mg-Si alloys has been proved to be better than that of Al-Zn-Mg and Al-Cu-Mg systems by various researchers [19][20][21][22][23] because of lower alloying degree and smaller potential difference between precipitates and matrix. Therefore, significant industrial interests have been attracted to the exact dependence between chemical compositions, thermo-mechanical history, and corrosion susceptibility of Al-Mg-Si alloys [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Heat Aging Treatments on the Cavitation Erosion Behavior of a Type 6082 Aluminum Alloy

Bordeasu,

Ghiban,

Micu

et al. 2023

Materials

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It is known that a number of parts that operate in liquid media, such as the propellers of motorboats and pleasure river vessels, as well as the rotors of household pumps and the radiators and pumps in the cooling system of motor vehicles are made, as a rule, of aluminum-based alloy. Research during maintenance leads to the conclusion that, in certain operating conditions, due to the turbulent character of the flow, with pressure drops to below the vaporization level, it inevitably reaches the threshold of cavitation, which manifests itself through its effects, especially through erosion. To increase the lifetime, these alloys are currently subjected to techniques to improve the structure’s resistance to the cyclic stresses of cavitational microjets. Among these techniques are volumetric heat treatments, which lead to changes in the microstructure and mechanical property values, with an effect on the behavior and resistance to cavitation erosion. This paper studies the influence of heat aging treatments on the cavitation erosion behavior of an aluminum alloy type 6082, in the cast state. The heat treatments applied were 140 °C/1 h, 12 h, 24 h and 180 °C/1 h, 12 h, 24 h. The MDEmax and MDERs parameters were determined and a correlation could be made between the values of the mechanical-resilient characteristics and the resistance to cavitation erosion in the case of aluminum alloy 6082.

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“…Copper can be distributed in several ways throughout the microstructure, which complicates mechanism studies. The primary age-hardening phase 1 is Al 2 CuMg (orthorhombic; a=4.01, b=9.25, c=7.15 A) which appears as more or less large equiaxed S particles at equilibrium, and as metastable S' plates 2 after aging for shorter times at lower temperature (~190°C). In addition, ubiquitous so-called "dispersoids" containing copper and manganese (prolate spheroid morphology) or iron (irregular "blocky" morphology) do not go into solution when the alloy is solid state homogenized (-495 °C) and are always present in the microstructure.…”

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confidence: 99%

Cu Nanoparticle Formation: Copper Redistribution During NaCl Solution Corrosion of Al-Cu-Mg Alloys

Ford¹,

Carpenter²,

Sieradzki³

1998

Microsc Microanal

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Aluminum-copper-magnesium alloys also containing manganese and iron (commercial designation 2024) are susceptible to marine corrosion and stress corrosion cracking. Susceptibility depends on heat treatment, and is thought to involve redistribution of copper from within the microstructure onto the surface of the corroding alloy, but few direct observations of the mechanism have been made. Copper can be distributed in several ways throughout the microstructure, which complicates mechanism studies. The primary age-hardening phase is Al2CuMg (orthorhombic; a=4.01, b=9.25, c=7.15 Å) which appears as more or less large equiaxed S particles at equilibrium, and as metastable S’ plates after aging for shorter times at lower temperature (∼190°C). In addition, ubiquitous so-called “dispersoids” containing copper and manganese (prolate spheroid morphology) or iron (irregular “blocky” morphology) do not go into solution when the alloy is solid state homogenized (-495 °C) and are always present in the microstructure. All of these phases are copper-rich sources for surface redistribution relative to the matrix during corrosion.

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Interrelation of TEM microstructure, composition, tensile properties, and corrosion resistance of Al-Cu-Mg-Mn alloys

Cited by 9 publications

References 12 publications

Estudo do efeito do ambiente no comportamento em fadiga de novas ligas 'AL' de grau aeronáutico

Estudo do efeito do ambiente no comportamento em fadiga de novas ligas 'AL' de grau aeronáutico

The Influence of Heat Aging Treatments on the Cavitation Erosion Behavior of a Type 6082 Aluminum Alloy

Cu Nanoparticle Formation: Copper Redistribution During NaCl Solution Corrosion of Al-Cu-Mg Alloys

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