| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Investigating the Effect of Deformation Twins on Fatigue Crack Growth Rate |
| Author(s) |
Ali Asli, Garrett Pataky |
| On-Site Speaker (Planned) |
Ali Asli |
| Abstract Scope |
High twin density has been shown to increase fatigue crack growth (FCG) resistance in nanocrystalline materials. This research investigates the hypothesis that bundles of deformation twin boundaries in coarse-grained materials will mimic this increased resistance to FCG. A Cu7at%Al model material was used due to its low stacking fault energy for ease of nucleating twins. Twin nucleation was performed via tensile pre-strain experiments at cryogenic temperatures. Electron backscatter diffraction and etching were used to confirm the presence of twins to be within the path of the crack growth. High cycle fatigue experiments were performed on the pre-strained samples as deformed and after an annealing treatment to decrease dislocation density. The results indicated a descending stage I FCG rate for the deformation twin-induced samples. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, |