Influence of intermetallic particles on the initiation and growth behavior of hydrogen micropores during high-temperature exposure in Al-Zn-Mg-Cu aluminum alloys

Su, Hang; Bhuiyan, Shahnewaz; Toda, Hiroyuki; Uesugi, Kentaro; Takeuchi, Akihisa; Watanabe, Yoshio

doi:10.1016/j.scriptamat.2017.03.020

Cited by 25 publications

(19 citation statements)

References 34 publications

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“…The work by Su et al [14] indicates that nucleated hydrogen micropores in particles show premature growth when under loading, revealing such research also that between 7 to 28% of fractures originate from hydrogen micropores. Often, in Al-Mg alloys, about half of hydrogen atoms are trapped in such micropores.…”

Section: Blister Formation Mechanism Through Oxide Filmmentioning

confidence: 92%

“…The analyzes of these authors show that a pure aluminum did not form micropores at heat treatment temperature of 550 °C in a time of 90 h. However, the hydrogen was trapped in its microstructure. Su et al [14] and Toda et al [49] identified that hydrogen gets stuck in vacancies, making it impossible to move vacancies. For a sample of Al-Zn-Mg alloy, Su et al [15] indicated distribution of hydrogen in favorable regions and its atomic concentration in regions, as shown in Figure 7.…”

Section: Blister Formation Mechanism Through Oxide Filmmentioning

confidence: 99%

“…Hydrogen is easily absorbed by reaction of aluminum with water, which comes from sources such as atmospheric moisture, flow of microscopic materials, wet casting tools or organic substances, thus supplying aluminum oxide and dissolved atomic hydrogen [10][11][12]. In addition, hydrogen absorption mechanisms in solution heat treatment start in surface reactions of aluminum with oxide layer [13][14][15][16], cathodic regions can favor hydrogen absorption reactions [17]. Despite this, hydrogen has a low solubility in molten aluminum and, in solid form, and at solution temperature, it has a solubility twenty times lower [12,18].…”

Section: Introductionmentioning

confidence: 99%

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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: Blister Formation Mechanism Through Oxide Filmmentioning

confidence: 92%

Section: Blister Formation Mechanism Through Oxide Filmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Diehl¹,

Schneider²,

Clarke³

2021

Tecnol. Metal. Mater. Min.

View full text Add to dashboard Cite

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“…12) Hydrogen micro pores are initiated heterogeneously on the intermetallic particles during the homogenization process. 9,13) In contrast, vacancies due to extensive plastic deformation are stabilized and agglomerated into nano voids in the presence of hydrogen during the rolling process. 14) During the in-situ tensile tests, it can be seen that nano voids are initiated uniformly across the whole specimen with an increase in applied strain levels, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Su, et al have proposed that internal hydrogen tends to be accumulated in the equivalent strain concentration region during deformation. 13) Nagumo, et al have revealed that vacancies are stabilized and agglomerated into nano voids in the presence of hydrogen. 17) Therefore, it can be inferred that the heterogeneous concentration of hydrostatic strain in the strain localization region might be attributed to the initiation of some invisible nano voids (<100 nm) due to localized vacancy concentration in the strain localization region.…”

Section: Resultsmentioning

confidence: 99%

Evolution Behavior of Hydrogen-Induced Nano Voids in Al–Zn–Mg–Cu Aluminum Alloys under Loading

Gao

Shimizu

et al. 2018

Mater. Trans.

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Synchrotron X-ray nanotomography, which offers a state-of-the-art resolution, has been applied for the 3D observations of hydrogen induced nano voids under different strain levels in AlZnMgCu aluminum alloys. A great number of nano voids are initiated uniformly across the whole specimen during a loading process. The average diameter and number density of initiated nano voids is 300 nm and 5 © 10 15 m ¹3 , respectively. No evidence has been observed that the formation of nano voids results in the propagation of hydrogen induced quasi-cleavage cracks and premature fracture of AlZnMgCu aluminum alloys. Since nano void is one of the hydrogen trap sites in AlZnMgCu aluminum alloys, the majority of hydrogen can be repartitioned to nano voids during deformation due to their high density.

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The Effect of Cycling Process Between −196 and 120 °C on Microstructure and Properties of Additively Manufactured 7050 Al Alloy

Liu,

Shao,

et al. 2023

Adv Eng Mater

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Wire arc additively manufactured (WAAM) aluminum alloys have been applied in the aerospace field. However, there was a lack of research on the stability of additive components under high‐ and low‐temperature cycling conditions in space. This study focuses on the evolution of microstructure, defects, and mechanical properties of WAAM 7050 aluminum alloy during high‐ and low‐temperature cycling from −196 to 120 °C. The number of cycles is 1, 2, 5, and 10, and one cycle time is 100 min. The results show that the number of η nanophases increase significantly after 5 cycles, and the η′ phases precipitate after 10 cycles. In defects, the porosity increases to 4 times of the as‐deposited state after 10 cycles, and the mean equivalent diameter of micropores is stabilized at 0.77 μm. In mechanical properties, the ultimate tensile strength decreases gradually with the increase of cycle times, and the hardness reaches the maximum of 143.2 HV after 5 cycles. The number of micropores increases after 10 cycles, and micropores have a weak effect on the failure mechanism. Cracks tend to sprout and expand along the eutectic phases and pores in the equiaxial grain zones, and equiaxial grain zones are the weak areas when they break.

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Influence of intermetallic particles on the initiation and growth behavior of hydrogen micropores during high-temperature exposure in Al-Zn-Mg-Cu aluminum alloys

Cited by 25 publications

References 34 publications

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Evolution Behavior of Hydrogen-Induced Nano Voids in Al–Zn–Mg–Cu Aluminum Alloys under Loading

The Effect of Cycling Process Between −196 and 120 °C on Microstructure and Properties of Additively Manufactured 7050 Al Alloy

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