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Meeting Materials Science & Technology 2020
Symposium Environmentally Assisted Cracking: Theory and Practice
Presentation Title Understanding Pitting Corrosion in a High-performance Aluminum Alloy by 4D X-ray Microtomography
Author(s) Daniel Sinclair , Sridhar Niverty, Nikhilesh Chawla
On-Site Speaker (Planned) Daniel Sinclair
Abstract Scope Aluminum alloys are commonly used for engineering applications due to their high strength to weight ratio and low cost. Pitting corrosion, accelerated by saltwater environments, can lead to fatigue cracks and stress corrosion cracking during service. Two-dimensional (2D) characterization methods are typically used to identify and characterize corrosion. These methods, however, are destructive and do not enable an efficient means of quantifying mechanisms of pit initiation and growth. In this study, we have used lab-scale x-ray microtomography to non-destructively observe, quantify, and understand pit growth in three dimensions over a 20-day corrosion period in an AA7075-T6 alloy. Pit depths were quantified over time using renderings of sample volumes, leading to an understanding of how inclusion particles, oxide formation and breakdown, and other corrosion mechanisms impact the growth and morphology of pits.
Proceedings Inclusion? Undecided


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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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