About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Additive Manufacturing of High Temperature Mo-Si-B-Ti Alloys |
| Author(s) |
John H. Perepezko, Longfei H Liu, Liam H Wood, Buzz H Rankouhi, Dan H Thoma, Fan Zhang, Chuan Zhang |
| On-Site Speaker (Planned) |
John H. Perepezko |
| Abstract Scope |
To increase the operating temperature of gas turbines beyond the limits of Ni base superalloys refractory metal alloys are receiving increased attention. For the enhanced performance an alloy must be designed to satisfy several challenging requirements involving mechanical properties, several thermophysical properties and environmental resistance above 1300℃. To address these challenges an effective design has been established based upon additive manufacturing (AM) utilizing a reactive synthesis of component powders of Mo, Si3N4, BN and Ti where a high throughput synthesis and characterization are employed together with computational thermodynamics to identify promising alloy compositions. The selected Mo-Si-B-Ti alloys include Ti for both density reduction to 9.2 g/cm3 and to limit the embrittlement effect of Si solubility in Mo. The alloy designs exhibit a high compressive strength of about 1.6 GPa and ductility above 20% at room temperature. With AM and optimized processing turbine blades have been produced at full scale. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, |