Relationship between hydrogen embrittlement and second-phase particles in a 7075 aluminum alloy

Manaka, Toshiaki; Itoh, Goroh

doi:10.2464/jilm.67.67

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The representative IMC particles in practical 7XXX alloys are Al 7 Cu 2 Fe and Mg 2 Si. 14,15) The presence of hydrogen trap sites inside these particles was investigated by Yamaguchi et al by first-principles calculations. 16) The researchers concluded that Mg 2 Si has no internal hydrogen trap sites and that Al 7 Cu 2 Fe has many hydrogen trap sites in crystal lattices with a maximum hydrogen binding energy of 0.56 eV/atom.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys

et al. 2022

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In recent years, it has been reported that intermetallic compound particles can suppress hydrogen embrittlement by hydrogen trapping. Some intermetallic particles in aluminum alloys, such as Al 7 Cu 2 Fe, have internal hydrogen trap sites; it is proposed that hydrogen embrittlement can be suppressed by preferential hydrogen partitioning in these sites. However, intermetallic compound particles act as fracture origin sites, and excessive addition degrades the mechanical properties of the material. In this study, we quantitatively evaluated the damage and decohesion behavior of intermetallic compound particles in high-hydrogen content 7XXX aluminum alloys by using in situ synchrotron radiation X-ray tomography. The results revealed that the hydrogen particles induced early high-strain localization, and the Al 7 Cu 2 Fe particles were damaged in that region due to its brittleness, resulting in early fracture. Hydrogen had no effects on the fracture and debonding behaviors of intermetallic compound particles, suggesting that the observed particle brittle fracture is dependent on their mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys

et al. 2022

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“…These are the major second phases observed in the 7xxx alloy. 6,7) There have been minimal reports on the analysis of hydrogen trapping by the second phase particles.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Trapping in Mg2Si and Al7FeCu2 Intermetallic Compounds in Aluminum Alloy: First-Principles Calculations

et al. 2020

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From first-principles calculations, we estimated the trapping energy of hydrogen atom at the interstitial site of perfect crystals of Mg 2 Si and Al 7 FeCu 2 intermetallic compounds in the aluminum matrix. We found that Al 7 FeCu 2 trapped hydrogen atoms strongly, whereas Mg 2 Si did not. The highest trapping energy in Al 7 FeCu 2 is 0.56 eV/atom. We also found that the density of hydrogen trapping can be increased up to about 13 atoms/nm 3 while keeping high trapping energy of about 0.40 eV/atom. We inferred that the Al 7 FeCu 2 phase might remove hydrogen from the aluminum matrix, hence, preventing hydrogen embrittlement of aluminum alloy.

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“…In Al-Cu-Mg alloys, on the other hand, the crack propagates by anodic dissolution along grain boundaries [1]. It has been reported that the peakaged Al-Zn-Mg ternary alloy showed degradation of ductility when a slow strain rate technique (SSRT) test was performed in humid air [2], which was attributed to hydrogen embrittlement [2][3][4][5]. On the other hand, the peak-aged Al-Cu-Mg ternary alloy did not show such a degradation in humid air [2].…”

Section: Introductionmentioning

confidence: 99%

Assessment of hydrogen embrittlement susceptibility of an Al-Cu-Mg alloy in humid air

et al. 2020

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In the present study, we investigated the hydrogen embrittlement susceptibility of Al-4%Cu-1.5%Mg alloys subjected to several heat treatments by means of SSRT tensile test and humid gas stress corrosion cracking(HG-SCC) test. For SSRT tensile test, the tensile test pieces were cut from cold-rolled sheets of 1mm thickness. The test pieces were solution-treated at 500 °C for 1h, water-quenched and aged at 140oC for 72h or 360h. SSRT tensile test was performed in two environments, humid air (HA) and dry nitrogen gas (DNG) at a strain rate of 1.39×10-6s-1. Fracture surfaces were observed with a scanning electron microscopy(SEM). For HG-SCC test, compact tension(CT) test pieces were cut from hot-rolled plate of 6mm thickness. The CT test pieces were solution-treated, water-quenched and aged at 190 °C for 9h, 50°C for 96h or 140°C for 72h. HG-SCC test was carried out based on High Pressure Institute of Japan standards; HPIS E103:2018. The pre-cracked CT specimens with stress loading were kept for 90 days in two environments, HA and DNG. After 90 days, in order to observe whether cracks propagated due to HG-SCC, the specimens were loaded up to fracture rapidly, followed by SEM observation. Tensile properties obtained by SSRT tensile tests were almost the same in two environments. Also, fracture surfaces were not affected by test environments. Moreover, in HG-SCC tests, crack propagation was not observed at each test conditions. Therefore, Al-4%Cu-1.5%Mg alloy had high-resistance to hydrogen embrittlement.

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Relationship between hydrogen embrittlement and second-phase particles in a 7075 aluminum alloy

Cited by 5 publications

References 4 publications

Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys

Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys

Hydrogen Trapping in Mg<sub>2</sub>Si and Al<sub>7</sub>FeCu<sub>2</sub> Intermetallic Compounds in Aluminum Alloy: First-Principles Calculations

Assessment of hydrogen embrittlement susceptibility of an Al-Cu-Mg alloy in humid air

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