| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
The Effect of Applied Potential and Loading Rate on the Hydrogen Environment-assisted Cracking Behavior of AA7075-T6511 |
| Author(s) |
Zachary D. Harris, Alen Korjenic, John R. Scully, James Burns |
| On-Site Speaker (Planned) |
Zachary D. Harris |
| Abstract Scope |
The effect of applied potential and loading rate on the hydrogen environment-assisted cracking behavior of the legacy aerospace aluminum alloy AA7075-T6511 was assessed using a slow-rising stress intensity (K) testing framework. Fracture mechanics experiments were performed in 0.6 M NaCl at applied potentials ranging from -1300 to -750 mVSCE (vs. saturated calomel electrode) and fixed loading rates (dK/dt) ranging from 0 to 2.0 MPa√m/hr. Results demonstrate that AA7075-T6511 exhibits similar crack growth rates and threshold stress intensities for potentials more negative than -1000 mVSCE and more positive than -900 mVSCE. However, between -900 and -1000 mVSCE, a clear reduction in HEAC susceptibility was observed. Interestingly, unlike other aluminum alloys, HEAC kinetics were found to relatively insensitive to the applied dK/dt in both 0.6 M and 1.0 M NaCl across the tested applied potential range. The mechanistic basis for these observations is assessed and the implications on HEAC mitigation strategies discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Environmental Effects, Mechanical Properties |