| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
In-situ Diffraction and Cohesive-zone Studies of the Fatigue-crack-growth Behavior in the ZK60 Mg Alloy |
| Author(s) |
Di Xie, Peter K. Liaw, Yang Ren, Yanfei Gao |
| On-Site Speaker (Planned) |
Di Xie |
| Abstract Scope |
Our limited knowledge of materials failure mechanisms places the ultimate restrictions on the technological viability of Mg alloys. The measurements of strain at the microstructural level are crucial to understanding fatigue crack behavior. In this work, we exploit the in-situ synchrotron X-ray diffraction to provide the high-resolution strain mapping near a fatigue tip in the ZK60 Mg alloy. Microscopic deformation mechanisms near the crack are identified. And an irreversible, hysteretic cohesive interface model is adopted to simulate a steady fatigue crack, which allows us to generate the stress/strain distribution and history near the fatigue crack tip. Coupled the Hill’s plasticity model with the in-situ diffraction technique, the plastic anisotropy on the retardation of fatigue crack growth and the elastic strain fields is investigated. This work, combining the micromechanical modeling with in situ diffraction studies, enhances the fundamental knowledge of Mg alloys by connecting the macroscopic behavior with microscopic mechanisms. |
| Proceedings Inclusion? |
Planned: |