| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Relating Corrosion Susceptibility to Microstructure via Multiscale Electron Microscopy |
| Author(s) |
Josh Kacher, Jordan Key, Jahnavi Desai |
| On-Site Speaker (Planned) |
Josh Kacher |
| Abstract Scope |
While chemical homogeneity is known to induce galvanic corrosion, the role of microstructural heterogeneities on localized corrosion susceptibility has not been rigorously established. Multiscale electron microscopy approaches, including data rich multimodal analysis and in situ testing, offer a pathway to establish a statistical and mechanistic understanding of the influence of microstructure on local corrosion behavior. In this study, the corrosion behavior of AA5xxx alloys, both sensitized and unsensitized, was investigated using electron backscatter diffraction (EBSD), automated feature detection, and in situ liquid cell transmission electron microscopy experiments (LC-TEM). EBSD coupled with automated feature detection provides statistically significant correlations between corrosion pit formation and grain size, orientation, grain boundary characteristics, and geometrically necessary dislocation density. In situ LC-TEM allows direct observations of corrosion initiation events at the nanoscale. Results will be discussed in terms of microstructural influences and the role of data-based analysis in understanding localized corrosion events. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |