Journal
CORROSION SCIENCE
Volume 199, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110161
Keywords
Environmentally Assisted Cracking (EAC); Stress Corrosion Cracking (SCC); High strength aluminium alloys; Fractography; Hydrogen Embrittlement
Funding
- Airbus
- EPSRC programme grant Light-Form [EP/R001715/1]
- Metallic Systems CDT [EP/L016273/1]
- Henry Royce Institute for Advanced Materials through EPSRC grants [EP/R00661X/1, EP/S019367/1, EP/P025021/1, EP/P025498/1]
- National Research Facility for Lab X-ray CT (NXCT) through EPSRC grant [EP/T02593X/1]
- Henry Moseley X-ray Imaging Facility through EPSRC grants [EP/F007906/1, EP/F001452/1, EP/M010619/1, EP/F028431/1, EP/M022498/1]
- [EP/I02249X]
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New-gen 7xxx series alloys have shown higher susceptibility to environmental assisted cracking (EAC) in humid air compared to AA7050 in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. The difficulty of crack initiation in AA7050 was attributed to its grain structure and intrinsic resistance of the grain boundaries to IG-EAC.
New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.
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