Assessment of hydrogen embrittlement via image-based techniques in Al–Zn–Mg–Cu aluminum alloys

Su, Hang; Toda, Hiroyuki; Shimizu, Kazuyuki; Uesugi, Kentaro; Takeuchi, Akihisa; Watanabe, Yoshio

doi:10.1016/j.actamat.2019.06.056

Cited by 76 publications

(47 citation statements)

References 66 publications

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“…The gauge length and cross-sectional area of the specimen were 0.7 mm and 0.6 mm © 0.6 mm, respectively; these dimensions are the same as those in a previous report. 6) We measured the hydrogen concentration in the specimens with thermal desorption analysis (TDA, PDHA-1000, NISSHA FIS, Inc.). The thermal desorption curve was obtained by heating from room temperature to 873 K for the palladium sample and to 773 K for the aluminum sample at a heating rate of 1.5 K/min.…”

Section: Methodsmentioning

confidence: 99%

“…The number of vacancies and dislocations, which are trapping sites that increase in number during a tensile test, can be estimated from the plastic strain distribution. 6,1821) Therefore, we qualitatively evaluated the increased number of these trapping sites by the threedimensional plastic strain distribution. Figure 7 shows the equivalent strain distribution in the same region as the KFM measurements, and the two highlighted frames within each image correspond to the regions shown in Fig.…”

Section: Effect Of the Mechanical And Microstructural Factors On Hydrogen Accumulationmentioning

confidence: 99%

“…In the localized deformation region, it was reported that the number of vacancies increased approximately 10 4 times while that of dislocations increased approximately several times due to deformation. 6,22) In addition, the hydrogen binding energy of dislocation is 16.4 kJ/mol, and this value is relatively low for the trapping sites in aluminum. 23) Since the binding energy of vacancies is 28 kJ/mol and higher than the value for dislocation, the accumulated hydrogen is preferentially repartitioned to vacancy.…”

Section: Effect Of the Mechanical And Microstructural Factors On Hydrogen Accumulationmentioning

confidence: 99%

“…However, even in a specimen that has been precharged with hydrogen, the hydrogen concentration at the interface is only approximately 10 24 atoms H/m 3 , which is 100 times lower than this debonding criterion. 6) Therefore, hydrogen should locally accumulate ahead of the crack tip during deformation for hydrogen embrittlement to occur. Investigating the temporal evolution of hydrogen diffusion with plastic deformation can help researchers further understand the hydrogen embrittlement behavior in aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Hydrogen Accumulation Behavior in Al–Zn–Mg Alloy under Strain with Kelvin Force Microscopy

et al. 2021

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Hydrogen embrittlement in aluminum alloys occurs due to local hydrogen accumulation during deformation. Investigating hydrogen diffusion with plastic deformation can help researchers further understand hydrogen embrittlement behavior in terms of its occurrence condition. We assessed hydrogen accumulation behavior in AlZnMg alloys under strain by combining tensile testing with Kelvin force microscopy. Additionally, the effects of microstructures on hydrogen accumulation were analyzed in detail. Hydrogen accumulated around specific grain boundaries, and it was likely that accumulated hydrogen was repartitioned to the generated vacancies, due to deformation, and the precipitate interfaces.

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Section: Methodsmentioning

confidence: 99%

Section: Effect Of the Mechanical And Microstructural Factors On Hydrogen Accumulationmentioning

confidence: 99%

Section: Effect Of the Mechanical And Microstructural Factors On Hydrogen Accumulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of Hydrogen Accumulation Behavior in Al–Zn–Mg Alloy under Strain with Kelvin Force Microscopy

et al. 2021

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“…At about 250°C and at normal pressure, magnesium and hydrogen can be produced, which can release hydrogen at low pressure or slightly higher temperature [22]. In the field of electrochemistry, hydrogen can also cause hydrogen corrosion in the form of hydrogen bulging [23][24][25], hydrogen embrittlement [26][27][28], and hydrogen corrosion [29,30]. Hydrogen can be immersed between the lattice of the metal and expand or deform the lattice and finally make the metal brittle that is called as hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

A New Method of Edge Crack Suppression in the Rolling Process of Magnesium Alloy Sheet and Study on the Method of Cathodic Protection

Zhu

et al. 2020

Advances in Materials Science and Engineering

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A new method is proposed to solve edge cracking and corrosion in rolling process of the magnesium alloy plate. Usually in the process, the edge cracking is caused by the great temperature difference between the edge and the center of the alloy plate and the corrosion is by water in air. The method uses hot air wrapped around the plate to perfectly prevent edge cracking and corrosion. The method also includes cathodic protection for the magnesium alloy based on electrochemistry. The suppression of cathodic protection on the chemical activity of the magnesium alloy was studied. The experiment shows that the new method of edge heating with hot air wrapping is effective to prevent edge cracking and corrosion. Also, the cathodic protection can effectively suppress the chemical activity of the magnesium alloy and improve the surface quality in the rolling process of the magnesium plate, which provides a new concept in rolling process of the magnesium alloy.

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The effect of friction stir processing on the hydrogen susceptibility of AA5083 specimens after hydrogen cathodic charging

Papantoniou

Karmiris-Obratański

Leszczyńska-Madej

et al. 2023

Int J Adv Manuf Technol

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The present study investigated the effect of hydrogen on the mechanical degradation of friction stir processed (FSPed) 5083 aluminum alloy by intense hydrogen cathodic charging (HCC). The effect of different numbers of FSP passes was investigated: 3 and 8 passes, respectively. Hydrogen-charged and uncharged specimens were subjected to tensile testing and microhardness evaluation analysis, and were examined through optical microscopy, focus variation microscopy (FVM), and scanning electron microscopy (SEM) both on the microstructure and fracture zone. The results showed that the FSP process introduced a refined microstructure with finer grains. This led to an improved mechanical response during tension tests of the uncharged specimens; the energy absorption increased from 85 MJ/m3 of the base material to 94 MJ/m3 and 97 MJ/m3 for the 3 and 8 FSP passes, respectively. The introduction of hydrogen through the HCC process led to a more brittle mechanical response with a decrease in the energy absorption capability for all the charged specimens. The more prone specimen was the 8 FSP passes specimen where the energy absorption dropped by 20% and 71% for the two different charging current densities. The 3 FSP passes specimen presented a reduction of energy absorption of 4% and 18%, respectively, where the base material presented a reduction of 8% and 14%, respectively. This brittle response is also evident from the microhardness testing where the hydrogen charging led to increased surface hardness values. The 3 FSP passes specimen presented a better mechanical response with respect to the base material specimen (and the 8 FSP passes specimen) for all the charging conditions, and this led to the conclusion that a small number FSP surface modification could be a beneficial surface modification process as it improves the mechanical response of the material and is not significantly affected by hydrogen charging environments.

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Assessment of hydrogen embrittlement via image-based techniques in Al–Zn–Mg–Cu aluminum alloys

Cited by 76 publications

References 66 publications

Assessment of Hydrogen Accumulation Behavior in Al–Zn–Mg Alloy under Strain with Kelvin Force Microscopy

Assessment of Hydrogen Accumulation Behavior in Al–Zn–Mg Alloy under Strain with Kelvin Force Microscopy

A New Method of Edge Crack Suppression in the Rolling Process of Magnesium Alloy Sheet and Study on the Method of Cathodic Protection

The effect of friction stir processing on the hydrogen susceptibility of AA5083 specimens after hydrogen cathodic charging

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