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Meeting MS&T22: Materials Science & Technology
Symposium Resisting Degradation from the Environment: A Symposium Honoring Carolyn M. Hansson’s Research and Pioneering Experiences as a Woman in STEM
Presentation Title Quantifying the Environmentally Assisted Cracking Initiation and Short Crack Behavior in New Generation 7xxx Aluminium
Author(s) Tim Burnett, Ryan Euesden, Yasser Aboura, Al Garner, Thomas Jailnin, Zak Barrett, Christian Engel, Phil Prangnell
On-Site Speaker (Planned) Tim Burnett
Abstract Scope New generation (new-gen) 7xxx aluminium alloys offer benefits in improved toughness and corrosion resistance. However, they can be more susceptible to Environmentally Assisted Cracking (EAC) in humid air. Initiation of EAC cracks has several mechanistically distinct stages of incubation, development of pre-cursors, proto-crack formation and short crack growth. Understanding initiation whilst critical to the overall material performance has always been difficult to study due to its stochastic nature. In this work, a high-resolution optical scanning system was developed, capable of in-situ monitoring the surface of constant displacement (4-point bend) tests. This has allowed for the unambiguous detection of EAC initiation sites and the ability to monitor the growth behaviour of short cracks in relation to the local microstructure. Subsequent site-specific fractography, combined with high–resolution SEM-EDX, has revealed the nature of the preferred initiation sites. This has led us to re-define the meaning of KEAC threshold in these materials.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Characterization of Internal Oxidation in Alloy 690 and Model Ni Alloys
Correlating Crack Tip pH to Environment Assisted Cracking Performance in Al Alloys
Corrosion and Biocompatibility of 316L Stainless Steels Fabricated by Selective Laser Melting
Corrosion and Environmentally Assisted Cracking (EAC) Evaluation of Additively Manufactured (AM) High Strength Precipitation Hardened Steel (UNS S17400)
Corrosion of Fe-Cr-Mn Stainless Steel in Supercritical Water
Evaluating the Sensitivities of SCC Susceptibility in Stainless-steel Nuclear Waste Storage Containers
Galvanic Corrosion of Active and Passive Steel Bars with Different Area Ratios
Investigation of Crack Initiation in Hydrogen Embrittled Ni-base Alloy 725
Liquid Metal Embrittlement: Cracking Open the Disparate Mechanisms
Oxidation Behavior of Model FeCrAl Steel and APMT Alloy After Exposure in Steam
Quantifying the Environmentally Assisted Cracking Initiation and Short Crack Behavior in New Generation 7xxx Aluminium
Relating Microstructure to Environmental Degradation in Al-Mg Alloys
The Effect of Microstructural Surface States on the Corrosion of Additively Manufactured 316 Stainless Steel

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