About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Understanding Pitting Corrosion in a High-performance Aluminum Alloy by Four-dimensional (4D) X-ray Microtomography |
Author(s) |
Daniel R. Sinclair, Sridhar Niverty, Nikhilesh Chawla |
On-Site Speaker (Planned) |
Daniel R. Sinclair |
Abstract Scope |
Aluminum alloys are commonly used in aeronautical and energy applications due to their high strength-to-weight ratio and low cost. Pitting corrosion is a major detriment to the service lifetimes of aluminum alloys in severe environments. Electrochemical analysis and two-dimensional (2D) characterization methods have previously produced limited mechanistic descriptions of corrosion processes. These methods do not, however, do not produce an in-depth image of localized corrosion mechanisms due to their destructive nature and limited regions of interest. In this study, we have used lab-scale x-ray microtomography to non-destructively quantify and characterize pit growth in three dimensions in a cold-rolled AA7075-T651 alloy. Renderings of sample volumes were used to correlate important trends in mechanisms of pitting with local microstructural features driven by sample processing. A more unified understanding of how inclusion particles and corrosion product contribute to stable pit growth was achieved and will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Characterization, Environmental Effects |