| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2025
|
| Presentation Title |
Flow Stress and Microstructural Evolution of TZM and Mo-La Alloys at Temperatures From 1400 to 1700 °C |
| Author(s) |
Monica R. Martinez Henriquez, Gary A. Rozak, Eric M. Taleff |
| On-Site Speaker (Planned) |
Monica R. Martinez Henriquez |
| Abstract Scope |
Flow stress and microstructural evolution at high temperatures are studied in commercially pure Mo and two Mo alloys: TZM (Ti-Zr-Mo) and Mo-0.6La (Mo with 0.6 wt% La). TZM contains oxide and carbide dispersoids with Ti and Zr, and Mo-La contains La2O3 dispersoids. Static annealing tests were performed at temperatures from 1400 to 1700 °C, and uniaxial tensile tests at 1500 and 1700 °C under constant true-strain rates of 10-3, 10-4 and 3×10-5 s-1. At high temperatures, the effects of dispersoids in TZM diminish, leading to grain sizes similar to unalloyed Mo, with only a 21% increase in ultimate tensile strength at 1700 °C. In contrast, the dispersoids in Mo-0.6La provide more effective pinning, resulting in a high recrystallization temperature and smaller grain sizes. Mo-0.6La exhibits up to twice the strength of TZM at 1700 °C with finer subgrains. The relationship between high-temperature strength and subgrain sizes during deformation is explored. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, |