About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Measuring Crack Tip pH to Elucidate Corrosion Fatigue Susceptibility Differences between Al-Cu-Mg and Al-Zn-Mg-Cu Alloys |
| Author(s) |
Gabby C. Montiel, Jenifer S Locke |
| On-Site Speaker (Planned) |
Gabby C. Montiel |
| Abstract Scope |
2xxx series (Al-Cu) and 7xxx series (Al-Zn) Al alloys are age-hardenable and widely used in aerospace industry. However, 7xxx alloys are more susceptible to corrosion fatigue (CF) in aqueous chloride environments. Literature establishes that the crack growth rate (da/dN) of 7xxx Al alloys is constant with decreasing fatigue loading frequency (f) at f below about 10 Hz, while 2xxx Al alloys have a decreasing da/dN with decreasing f in this same f range. Additionally, 7xxx Al alloys exhibit higher da/dN in aqueous chloride solutions than lab air, while the inverse is true for 2xxx Al alloys at f below approximately 1 Hz. This work aims to quantify CF crack growth rates as a function of f, while measuring crack tip pH in alloys with varying copper and zinc content to better understand the role of corroding Al-Cu-X secondary phase particles play in crack tip electrochemistry and CF behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Environmental Effects, |