Stress corrosion cracking and hydrogen embrittlement of an Al–Zn–Mg–Cu alloy

Song, Renguo; Dietzel, W.; Zhang, B.J.; Liu, W.J.; Tseng, M.K.; Atrens, Andrej

doi:10.1016/j.actamat.2004.06.023

Cited by 246 publications

(95 citation statements)

References 55 publications

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“…In contrast, at present there is no information regarding the H-influenced fracture behaviour of the small precipitates that are effective for precipitation hardening, although there are promising indications, extrapolating from their positive influence for some heat treatment conditions in Al alloys. SCC resistance is much higher for Al alloys in the over-aged condition and for particular double aging conditions [61] .…”

Section: Significance and Future Directionsmentioning

confidence: 99%

Stress Corrosion Cracking of Magnesium Alloys

2011

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An overview is provided of our current understanding of SCC of Mg alloys. TGSCC is caused by an interaction of H with the microstructure so a detailed study of H-trap interactions is needed in order to design alloys resistant to TGSCC. This understanding is urgently needed because prior research indicates that many Mg alloys have a threshold stress for stress corrosion cracking of the order of half the yield stress in common environments including high-purity water.SCC fracture surface for AZ91 showing fracture of a β-particle ahead of the min crack

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Section: Significance and Future Directionsmentioning

confidence: 99%

Stress Corrosion Cracking of Magnesium Alloys

2011

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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%

“…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%

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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“…This is an example of grain boundary hydrogen embrittlement mechanism. [32][33][34][35][36][37] Therefore, the SCC mechanism for the two aluminum alloys must be simultaneous anodic dissolution and hydrogen embrittlement of grain boundaries under slow straining in an aqueous NaCl solution.…”

Section: Scc Mechanismmentioning

confidence: 99%

“…There have been several mechanisms proposed, capable of explaining the SCC behavior of aluminum alloys. Those mechanisms include, but not limited to, anodic dissolution [26][27][28][29][30][31] and hydrogen embrittlement [32][33][34][35][36][37] of grain boundary.…”

Section: Scc Mechanismmentioning

confidence: 99%

Stress Corrosion Cracking of Aluminum Alloys

Lee¹,

Taylor²,

Liu³

et al. 2012

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Naval Air The effects of environment concentration and strain rate on the stress corrosion cracking (SCC) behavior of 5083-H131 and 7075-T6 aluminum alloys were studied, conducting electrochemical measurement and slow strain rate test. The employed environments were pH 7.3 aqueous solutions of 0 to 20% NaCl, and the applied strain rate ranged from 10 -8 s -1 to 10 -4 s -1 . A comparative test was also carried out in air. After the tests, the fracture surface morphology was examined by scanning electron microscopy, and the microstructure in the vicinity of the fracture by light microscopy to clarify the SCC mode. The results indicated: 1. The SCC susceptibility is a little below 0.5% NaCl but it is raised noticeably with increasing NaCl concentration above 0.5% NaCl. 2. Compared to 7075-T6 aluminum alloy, 5083-H131 aluminum alloy has inferior mechanical property and it is highly susceptible to SCC. 3. The corrosion potential is lower and the corrosion rate is greater for higher NaCl concentration. 4. The SCC susceptibility increases with decreasing strain rate. 4. The SCC mode is crack initiation at the junctions of grain boundaries with specimen surface, and crack propagation along grain boundaries into the specimen, attributed to hydrogen embrittlement and anodic dissolution. ii SUMMARY The effects of environment concentration and strain rate on the stress corrosion cracking (SCC) behavior of 5083-H131 and 7075-T6 aluminum alloys were studied, conducting electrochemical measurement and slow strain rate test. The employed environments were pH 7.3 aqueous solutions of 0 to 20% NaCl, and the applied strain rate ranged from 10 -8 s -1 to 10 -4 s -1 . A comparative test was also carried out in air. After the tests, the fracture surface morphology was examined by scanning electron microscopy, and the microstructure in the vicinity of the fracture by light microscopy to clarify the SCC mode. The results indicated: 1. The SCC susceptibility is a little below 0.5% NaCl but it is raised noticeably with increasing NaCl concentration above 0.5% NaCl. 2. Compared to 7075-T6 aluminum alloy, 5083-H131 aluminum alloy has inferior mechanical property and it is highly susceptible to SCC. 3. The corrosion potential is lower and the corrosion rate is greater for higher NaCl concentration. 4. The SCC susceptibility increases with decreasing strain rate. 4. The SCC mode is crack initiation at the junctions of grain boundaries with specimen surface, and crack propagation along grain boundaries into the specimen, attributed to hydrogen embrittlement and anodi...

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Stress corrosion cracking and hydrogen embrittlement of an Al–Zn–Mg–Cu alloy

Cited by 246 publications

References 55 publications

Stress Corrosion Cracking of Magnesium Alloys

Stress Corrosion Cracking of Magnesium Alloys

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

Stress Corrosion Cracking of Aluminum Alloys

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