| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Resisting Degradation from the Environment: A Symposium Honoring Carolyn M. Hansson’s Research and Pioneering Experiences as a Woman in STEM
|
| Presentation Title |
Correlating Crack Tip pH to Environment Assisted Cracking Performance in Al Alloys |
| Author(s) |
Jenifer S. Locke, Katrina Catledge, Gabby Montiel, Gabriella Marino |
| On-Site Speaker (Planned) |
Jenifer S. Locke |
| Abstract Scope |
Environment assisted cracking is driven by both mechanical and environmental driving forces for cracking that exist at a crack tip. The environmental driving forces at the crack tip, while related to the external environment, are predicted to deviate greatly from those that exist in the bulk environment. The literature contains modeling studies that predict the deviations of crack tip pH and potential from the bulk environment, but only limited experimental information exists. The discussed research spans several Al alloy systems loading in both corrosion fatigue and stress corrosion cracking scenarios to understand how and if performance changes are linked to changes in crack tip pH. For example, in sensitized 5xxx Al alloys large cathodic polarizations under low frequency corrosion fatigue led to crack arrest, which was linked to the development of a basic crack environment likely due to increased cathodic reaction kinetics in the crack wake. |