| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Aging and Compatibility: Experimental and Computational Approaches to Enable Lifetime Predictions
|
| Presentation Title |
Environmentally assisted corrosion testing of 7xxx series aluminum to create an SCC susceptibility profile for temperature, humidity, and stress through accelerated testing. |
| Author(s) |
Paul David Paradise, Zachary Harris, Steven Buchbaum, David Chen, Sylvie Aubry, Greg Nyce, Roger Qiu |
| On-Site Speaker (Planned) |
Paul David Paradise |
| Abstract Scope |
Environmentally assisted stress corrosion cracking (SCC) of 7050-T7451 is explored with the use of constant strain test fixtures and slow strain rate testing (SSRT). Advantages are found with the two different testing methodologies; the constant strain provides a more realistic testing environment while the SSRT can accelerate the potential corrosion damage to infer SCC susceptibility at a much faster rate. A SCC temperature-humidity-stress map is created to elucidate regions of greater susceptibility to SCC damage and to identify threshold values that accelerate the SCC damage. It was found that brittle, secondary phases at the surface were nucleators for SCC and crack propagation proceeded primarily by cleavage. The amount of corrosion damage increased non-linearly with aging stress, temperature, and humidity. Results for the constant strain test showed that SCC damage was found through fractography of the samples aged for 6 months.
Prepared by LLNL under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Aluminum, Mechanical Properties |