About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Investigation of the Influence of GBPs and PFZs on Fatigue Crack Propagation Behavior in T7-Heat Treated Al-Zn-Mg-Cu Alloy via CP-FEM |
| Author(s) |
Seonho Shin, Yong Hee Jo, Hyoung-Wook Kim, Sangyul Ha, HyoKyung Sung |
| On-Site Speaker (Planned) |
Seonho Shin |
| Abstract Scope |
This study investigates the effect of grain boundary precipitates (GBPs) and precipitate-free zones (PFZs) on fatigue crack propagation (FCP) behavior in a T7 heat-treated Al-Zn-Mg-Cu alloy. While T7 treatment enhances tensile strength and stress corrosion cracking (SCC) resistance, it also induces GBPs and PFZs, which strongly influence crack growth paths and rates. In particular, the PFZ width and GBP distribution determine whether cracks propagate along grain boundaries and how energy is dissipated at the crack tip. Electron backscatter diffraction (EBSD) was used to quantitatively characterize these microstructural features. FCP tests were conducted to evaluate crack propagation behavior. Additionally, the crystal plasticity finite element method (CP-FEM) was employed to simulate local deformation near GBPs and PFZs, enabling insight into fracture mechanisms. This work provides a deeper understanding of microstructure–crack interaction and supports the design of fatigue-resistant microstructures in high-strength aluminum alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Computational Materials Science & Engineering, |