| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Correlating Crack Tip pH to Corrosion Fatigue Performance in Al Alloys |
| Author(s) |
Jenifer S. Locke, Katrina Catledge, Gabriella C Montiel, Mary E Cefaratti, David Schrock, Saba Nava Esmaeely |
| On-Site Speaker (Planned) |
Jenifer S. Locke |
| Abstract Scope |
For AA5xxx Al alloys, large cathodic polarizations have been shown to arrest both stress corrosion and corrosion fatigue cracking. Recent research suggests this arrest is due crack tip blunting. The current leading hypothesis for crack tip blunting in sensitized AA5xxx Al alloys loaded in aqueous chloride solutions and placed under cathodic polarization is increased cathodic reactions along the crack wake creating alkaline conditions that facilitate a breakdown of crack wake passivity and subsequent corrosion induced blunting of the crack tip. Research is ongoing to measure the crack tip pH of sensitized AA5xxx Al alloys under freely corroding conditions and several cathodic polarizations to produce results that either support or refute the alkaline corrosion crack tip blunting hypothesis. This talk will discuss this work as well as the methodology used for actively measuring crack tip pH while controlling K and measuring da/dN or da/dt depending on the loading spectrum applied. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Environmental Effects, Mechanical Properties |