| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Microstructural and Mechanical Evolution of Aluminum 7075-T6 during Non-reversible Fatigue Loading |
| Author(s) |
Joseph Indeck, Gabriel Demeneghi, Jason Mayeur, Cyril Williams, Kavan Hazeli |
| On-Site Speaker (Planned) |
Joseph Indeck |
| Abstract Scope |
This work details microstructural changes, and their effect on subsequent mechanical properties, of aluminum 7075-T6 during non-reversible fatigue loading. Experiments on aluminum 7075-T6 at different tensile mean stresses were interrupted at 25% and 75% of the fatigue life. Scanning electron microscopy, electron backscatter diffraction, and Vickers microhardness were used to quantify changes in the microstructure of the fatigued material. Cracking of larger sized iron inclusions and an increase in voids was observed in the subsurface material due to fatigue. An increase in the total amount of voids correlated to mechanical property changes of the post-fatigued material. Quasi-static strength of the material at specific fatigue life ratios was seen to decrease as the mean stress was increased whereas dynamic strength remained constant. The presented results establish that the subsequent post-fatigue mechanical properties of aluminum 7075-T6 is dependent on both the mean stress level and the subsequent loading strain rate. |
| Proceedings Inclusion? |
Planned: |