Role of temper conditions on the hydrogen embrittlement behavior of AA 7010

Krishnan, M.; Raja, V.S.

doi:10.1016/j.corsci.2019.03.004

Cited by 15 publications

(4 citation statements)

References 36 publications

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“…Almost all metals contain small amounts of oxygen, hydrogen and nitrogen in their composition, which are often referred to as gases in metals [1,2], whether or not they exist as oxides, hydrides and nitrides [3][4][5]. The deleterious effects of hydrogen on mechanical properties of metals are well known and have been extensively studied [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Diehl¹,

Schneider²,

Clarke³

2021

Tecnol. Metal. Mater. Min.

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The solution treatment of aluminum alloys can be restricted by the presence of porosity defects caused by the moisture present in the process or by the hydrated front on the material surface. Hydrogen blisters cause deleterious effects on mechanical properties and surface finish. However, the formation of bubbles in solid aluminum is not caused only by the known reaction 2Al+3H 2 O=3H 2 +Al 2 O 3 , as it does not explain the interaction of the aluminum oxide layer with the formation mechanisms. In addition, the literature approaches show that there is more than one mechanism for the formation of these defects, but no work has made an association between them. Thus, the objective of this work is to carry out extensive research on the state of the art of hydrogen blister formation in aluminum alloys during the solubilization heat treatment. Contemplating different proposed mechanisms of bubble formation on the surface and structure, the analysis of this association of approaches indicated that the mechanisms depend on both permeability, where the hydrated oxide front creates passage for the formation of blister in the sublayer, as well as diffusion and hydrogen solubility in the microstructure.

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Section: Introductionmentioning

confidence: 99%

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Diehl¹,

Schneider²,

Clarke³

2021

Tecnol. Metal. Mater. Min.

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“…One important result of the interaction between H and dislocations revealed by microstructural observations is that H can increase the propensity for slip planarity in 310s austenitic steels, Al, Ni-Co, Ni, and Ni-based superalloys [ 18 , 19 ]. The slip planarity would inhibit the relaxation of dislocation pileups by cross-slip and restrict dislocations from a given source to a narrow slip band.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Study of the Effect of Hydrogen on the Tendency toward Slip Planarity in Bcc Iron

Zheng

Zhang

et al. 2023

Materials

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H-enhanced slip planarity is generally explained in terms of H-reducing stacking fault energy in fcc systems. Here, we showed that H-decreasing dislocation line energies can enhance the tendency toward slip planarity in bcc Fe through systematically studying the interaction between H and 1/2 <111> {110} dislocations using the EAM potential for Fe-H systems. It was found that the binding energy of H, the excess H in the atmosphere, and the interaction energy of H increased with edge components, leading to larger decrements in the line energies of the edge and increased mixed dislocations than those of a screw dislocation. The consequence of such interaction patterns is an increment in the energy change in the system when the edge and mixed dislocations are converted to screw dislocations as compared to the H-free cases. The cross-slip in bcc Fe is thus suppressed by H, increasing the tendency toward slip planarity.

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“…Researchers have shown that the primary cause of SCC in aluminum alloys is anodic dissolution, while for the 7xxx series of aluminum alloys the SCC is caused by hydrogen embrittlement [25,26]. Previous studies have mostly focused on the SCC behavior of different types of Al alloys, including chloride solutions [27][28][29][30][31][32], as well as in exfoliation corrosion environments [9][10][11]. Alexopoulos et al [33] studied the effect of corrosion exposure on ultra-thin aluminum sheets and observed that for low-acceleration corrosion exposure, no surface deterioration existed.…”

Section: Introductionmentioning

confidence: 99%

“…Xie et al [37] obtained results in favor of the fact that stress corrosion cracking resistance is significantly improved by step quenching and ageing heat treatments. The influence of Al alloy precipitates [28], their compositions [29], the different testing parameters [27,30], and the roles of hydrogen and corrosion [38][39][40] were useful in revealing the mechanism of SCC for high-strength Al alloys. Fuente et al [41] studied the peculiarities of the long-term corrosion of aluminum in industrial environments and concluded that the corrosion is influenced by the following factors: (a) the formation of highly cracked bayerite layers of a certain thickness; (b) the abundant formation of pitting on the base aluminum; (c) the abundant formation of amorphous aluminum sulfates throughout the thickness of the corrosion product layer; (d) the presence of chlorine in the bottom of the formed corrosion pits.…”

Section: Introductionmentioning

confidence: 99%

Stress Corrosion Cracking Behavior of Fine-Grained Al5083 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

et al. 2021

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In the present study, the stress corrosion cracking (SCC) behavior of ECAP Al5083 alloy was investigated in air as well as in 3.5 % NaCl solution using the slow strain rate tensile test (SSRT). The characteristics of grain boundary precipitates (GBPs), specifically the microchemistry of the SCC behavior of Al5083 alloys, both in “as-received” condition and when deformed by the ECAP process, were examined. The correlations between the SCC resistance and GBP microchemistry were examined. A microstructural evaluation was performed using an optical microscope. SCC tests were carried out using a universal tensile testing machine and the fracture surfaces were studied using scanning electron microscopy (SEM). A strain rate of 1×10−6 s−1 was applied for the SSRT. As the passes increased, the SCC susceptibility of the fine-grained ECAP Al5083 alloy also increased. Moreover, higher ultimate tensile strength and greater elongation were observed. This was due to grain refinement, high-density separations, and the expanded extent of high-density dislocations instigated by severe plastic deformation. Due to the high strength and elongation, the failure analysis showed a ductile mode of fracture. Electron backscattering diffraction (EBSD) analysis was performed to determine more clearly the nature of cracking. EBSD analysis showed that the crack propagation occurred in both transgranular and intergranular modes.

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Role of temper conditions on the hydrogen embrittlement behavior of AA 7010

Cited by 15 publications

References 36 publications

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Atomistic Study of the Effect of Hydrogen on the Tendency toward Slip Planarity in Bcc Iron

Stress Corrosion Cracking Behavior of Fine-Grained Al5083 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

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