About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Al, slip planarity and fatigue performance in Ti alloys |
| Author(s) |
Oscar Langdon, Zachary Kloenne, Shelly Conroy, David Dye |
| On-Site Speaker (Planned) |
Oscar Langdon |
| Abstract Scope |
Ti-6Al-4V accounts for the majority of Ti alloy used in aeroengine components. Other α + β Ti alloys in commercial use such as Ti-6246, Ti-6242, Ti-834, Ti-17, Ti-811 also contain at least 6 wt.% Al. Alloying with such Al levels, combined with typical processing will promote short range ordering and/or DO19 α2 precipitation. Under plastic deformation, these precipitates suppress dislocation cross-slip, resulting in a planarized dislocation configuration. While Ti-64 has a notched HCF strength just below its yield strength, the low Al alloy, Ti-407 (Ti-4V-0.7Al), the notched HCF strength was measured to be far above (~50%) its yield stress. Moreover, Ti-407 did not present the typical drop in fatigue performance in the mid-R loading regime. It is proposed that planarized dislocations induce more intense stress fields at grain boundaries and thus have negative consequences on fatigue crack initiation. 4DSTEM was used to measure semi-quantitative strain maps at rogue grain pairs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Titanium, |