About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Nanoscale Real-Time Analysis of Stress Corrosion in Aluminum Alloy Using Quantitative Phase Microscopy |
Author(s) |
Raja Shekar B. Dandu , Joseph G Thomas, Yizheng Zhu, Alexander S Brand, Wenjun Cai |
On-Site Speaker (Planned) |
Raja Shekar B. Dandu |
Abstract Scope |
Chloride-induced stress corrosion cracking is difficult to predict due to the variation in fracture toughness, heavily influenced by grain-level heterogeneity. The coupling of stress and corrosion is often evaluated macroscopically, but the grain-level deformation evolution prior to crack initiation and during crack propagation remains poorly understood. In this study, we developed a novel quantitative phase microscopy (QPM) for nanoscale, real-time assessment of stress corrosion in aluminum alloys. QPM's high sensitivity and rapid image capture enable detailed tracking of grain level deformation under various tensile loads, supplemented by electrochemical tests to measure current densities and corrosion rates. QPM provided 3D profiles of corroded surfaces, highlighting variations in pit formation rate, distribution, and depth across different loads. These findings provide quantitative measurements of pit formation kinetics as a function of load at the individual grain level, paving the way for predictive models of crack initiation and propagation based on the metal's microstructure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Environmental Effects, Characterization |