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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 Relating Microstructure to Environmental Degradation in Al-Mg Alloys
Author(s) Josh Kacher
On-Site Speaker (Planned) Josh Kacher
Abstract Scope Al-Mg alloys are seeing increasing application in naval and automotive industries due to their high strength-to-weight ratio and excellent corrosion resistance. However, these alloys are susceptible to sensitization at elevated temperatures, resulting in localized corrosion and stress corrosion cracking at the grain boundaries. In this study, we combine electron backscatter diffraction (EBSD) with corrosion and stress corrosion cracking experiments to relate microstructural characteristics to susceptibility to localized attack. This approach facilitates the rapid exploration of thousands of grain boundaries. In addition to the grain boundary and crystallographic orientation information, EBSD also provides insight into the local density of geometrically necessary dislocations. Our results show that localized accumulation of dislocations at grain boundaries promotes Mg-rich β-phase formation, increasing the susceptibility to stress corrosion cracking. We show that even low angle grain boundaries, which are traditionally considered resistant to sensitization, can form β-phase in the presence of local dislocation accumulation.


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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