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Meeting Materials Science & Technology 2020
Symposium Environmentally Assisted Cracking: Theory and Practice
Presentation Title Microstructure and Beta Phase Distribution Effects on Environmental Fracture Susceptibility in Al-Mg Alloys
Author(s) Matthew McMahon, William Golumbfskie
On-Site Speaker (Planned) Matthew McMahon
Abstract Scope Al-Mg alloys are popular structural materials in marine applications due to their high strength-to-weight ratio and general corrosion resistance. However, extended time in service has demonstrated that these alloys may become sensitized through precipitation of β phase on the grain boundaries, which enables intergranular corrosion and/or stress corrosion cracking (IG-SCC). New alloy tempers such as – H128 are promising for slowing this intergranular precipitation, but questions remain concerning the IG-SCC susceptibility of this heat treatment once a significant sensitization level has been reached (Nitric Acid Mass Loss Test (NAMLT) value greater than 15 mg/cm2). The present research compares the IG-SCC susceptibility of AA5083-H128 to other common AA5xxx-series alloys at constant sensitization level. Slight differences in IG-SCC susceptibility are evident due to microstructural differences, such as percent recrystallization, as well as differences in yield strength. These differences are resolved based on understanding of hydrogen concentration in the fracture process zone.
Proceedings Inclusion? Undecided


Analyzing High-angle Grain Boundary Network Connectivity Using Graph Theory
Assessing the Influence of Hydrogen on The Deformation Behavior of a Precipitation-hardened Nickel-based Alloy
Atomistic Simulations of the Transport and Trapping of Hydrogen in Zirconium
Corrosion Fatigue Testing of AA7085-T7451 in Complex Atmospheric Environments of Varied Humidity with Surface Salt Loading
Cracking Mechanism of Carbon Steel in Presence of H2S/CO2 and H2S Scavenger, a Theory Based on Electrochemistry, Raman, and Tensile Testing
Directional Sensitization Responses in 5XXX Series Aluminum Alloy Microstructures
Elucidating the Loading Rate Dependence of Hydrogen Environment-assisted Cracking Behavior in Ti, Fe, Al, and Ni-based Structural Alloys
Hydrostatic Instability as the Underlying Mechanism of Hydrogen Embrittlement
Introductory Comments: Environmentally Assisted Cracking: Theory and Practice
Microstructure and Beta Phase Distribution Effects on Environmental Fracture Susceptibility in Al-Mg Alloys
Pit-to-Crack Transition in Stress Corrosion Cracking of Type 304 Stainless Steels Under Marine Exposure Conditions
The Relationship between Post-build Stress-relief Heat Treatment and the Hydrogen Embrittlement Susceptibility of Additively Manufactured IN625
The Role of SCC in Corrosion Fatigue Kinetics of AA5456-H116
Understanding Pitting Corrosion in a High-performance Aluminum Alloy by 4D X-ray Microtomography

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