Hydrogen embrittlement and trapping in Al6%Zn-3%Mg

Christodoulou, L.; Flower, H. M.

doi:10.1016/0001-6160(80)90138-8

Cited by 179 publications

(69 citation statements)

References 6 publications

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“…[13][14][15][16][17][18][19][20][21][22][23][24][25] Typical PFZ widths, grain boundary precipitates and dislocation slip behaviors for various tempers are shown in Fig. 8-9.…”

Section: Microstructural Observationsmentioning

confidence: 99%

“…In the dislocation-assisted cracking mechanism, several researchers 2,13,[16][17][18] demonstrated that peakaged condition that had low resistance to SCC had long straight narrow slip bands after deformation, while overaged condition that had high resistance to SCC exhibited more homogeneous slip after deformation. A detailed analysis demonstrated that increasing the matrix precipitate can improve the SCC resistance of the alloys, because it can result in the change dislocation slip type from the planar slip to homogenous slip mode.…”

Section: Microstructural Observationsmentioning

confidence: 99%

“…Several investigations have reported that the SCC mechanism involves anodic dissolution, [13][14][15] hydrogeninduced cracking (HIC), 5,13,[16][17][18] passive film rupture, 13,19) hydrogen embrittlement (HE), 14,15,20) magnesium segregation to grain boundaries [21][22][23] and a precipitate free zone (PFZ) along grain boundary. 24,25) However, the microstructural characteristics of Al-Zn-Mg high strength aluminum alloys are well known to have a strong influence not only on the mechanical properties but also on SCC susceptibility.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Microstructure on the Mechanical Properties and Stress Corrosion Cracking of an Al-Zn-Mg-Sc-Zr Alloy by Various Temper Treatments

Wang

Hsu

et al. 2007

Mater. Trans.

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The high strength Al-Zn-Mg alloy used in the aerospace industry is strengthened by coherent G.P. zones and semicoherent 0 phase. However, this series of aluminum alloys are susceptible to stress corrosion cracking (SCC), particularly when aged to the peak-aged state of T6 temper. In this study, the effect of microstructure on mechanical properties and stress corrosion cracking of the alloy was investigated for alloys tempered to T6, RRA, Two-Step and T7 conditions by tensile test in air, SCC test and polarization test in a 3.5%NaCl solution. It is shown that the improvement in SCC resistance correlates very well with the size of matrix precipitates and grain boundary precipitates. T7 temper can produce larger sizes of both the matrix precipitates and grain boundary precipitates than that of T6, RRA and Two-step tempers, causing a decrease in the length and density of dislocation lines, which results in the decrease of stress concentration at grain boundary and greatly improving the SCC resistance. The addition of Sc and Zr to high strength Al-Zn-Mg alloys has been found to simultaneously improve the tensile strength and SCC resistance.

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“…[13][14][15][16][17][18][19][20][21][22][23][24][25] Typical PFZ widths, grain boundary precipitates and dislocation slip behaviors for various tempers are shown in Fig. 8-9.…”

Section: Microstructural Observationsmentioning

confidence: 99%

Section: Microstructural Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Microstructure on the Mechanical Properties and Stress Corrosion Cracking of an Al-Zn-Mg-Sc-Zr Alloy by Various Temper Treatments

Wang

Hsu

et al. 2007

Mater. Trans.

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“…Hydrogen -produced during corrosion-has been accused of diffusing to the interior, leading to material embrittlement through hydrogen-metal interactions [6,7,8]. Despite the lack of a universally accepted hydrogen embrittlement mechanism, a generally recognized common feature is that some critical concentration of hydrogen must build-up at potential crack sites, for failure to initiate.…”

Section: Introductionmentioning

confidence: 99%

Characterization of trapped hydrogen in exfoliation corroded aluminium alloy 2024

et al. 1999

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“…10,11) However, the present study has not yet been successful in determining the state and/or distribution of hydrogen in the alloy, because of no distinct evolution peak in the curves of flux-treated specimens and of some scattering in the results. Figure 4 shows examples of stress-strain curves measured on the as-polished and flux-treated specimens, along with the result of the as-applied specimen, whose solidified-flux and corrosion products were not removed and remained during the test.…”

Section: Changes In Hydrogen Desorption Characteristicsmentioning

confidence: 83%

Evaluation of Susceptibility to Hydrogen Embrittlement of 7075 Aluminum Alloy by Hydrogen Addition Using Flax-Treatment Method

et al. 2006

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It is more difficult with aluminum alloys to investigate the effect of hydrogen on their mechanical properties than with steels because of their stable and protective oxide films, which act as a strong barrier for hydrogen penetration. In this study, after the flux-treatment, 7075-T6 alloy was subjected to thermal desorption spectroscopic (TDS) analysis and tensile test using the slow strain rate technique (SSRT) to establish a procedure for adding hydrogen to aluminum alloys and clarify the influence of hydrogen on their environmental embrittlement. The fluxtreatment consisted of applying a flux-solution for soldering on specimen surfaces and vaporizing water of the solution. These flux-treated specimens were exposed in a desiccator for various periods of time and then the solidified-flux and corrosion products were removed from the specimen surfaces before the TDS analysis and the tensile test. The experimental results revealed that hydrogen was absorbed into the alloy by the flux-treatment and the hydrogen content had a tendency to increase with increasing exposure time. Additionally, the fracture strain of tensile specimen decreased with exposure time, resulting in more severe embrittlement. Consequently, this flux-treatment method was considered to be an appropriate procedure for adding hydrogen to aluminum alloys and for evaluating their susceptibility to hydrogen embrittlement when combined with SSRT.

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Hydrogen embrittlement and trapping in Al6%Zn-3%Mg

Cited by 179 publications

References 6 publications

Effects of Microstructure on the Mechanical Properties and Stress Corrosion Cracking of an Al-Zn-Mg-Sc-Zr Alloy by Various Temper Treatments

Effects of Microstructure on the Mechanical Properties and Stress Corrosion Cracking of an Al-Zn-Mg-Sc-Zr Alloy by Various Temper Treatments

Characterization of trapped hydrogen in exfoliation corroded aluminium alloy 2024

Evaluation of Susceptibility to Hydrogen Embrittlement of 7075 Aluminum Alloy by Hydrogen Addition Using Flax-Treatment Method

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