| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Reactive Synthesis in Additive Manufacturing of an Ultrahigh-Temperature Mo-Si-B-Ti Alloy |
| Author(s) |
Nafisul Haque, Behzad Rankouhi, Phalgun Nelaturu, Longfei Liu, Fan Zhang, John H. Perepezko, Dan J. Thoma |
| On-Site Speaker (Planned) |
Nafisul Haque |
| Abstract Scope |
Refractory alloys of Mo-Si-B can retain strength at temperatures from 1100 °C to 1300 °C as well as resist oxidation at 1300 °C. However, alloys in this ternary system tend to be brittle and have densities above 9 g/cm3. To mitigate these issues, this study explores Ti additions. A new alloy design using the (Moss) + MoB + Mo5SiB2 (T2) tie triangle with 10 at. %Ti lowers the Si solubility in Moss for increased ductility as well as reduces the density below 9 g/cm3. To fabricate specimens, powder blends of Mo, Ti, Si, and BN were used in laser powder bed fusion. The BN dissociates and the exothermic reaction to form the T2 supplies additional heat. Heat-treated samples exhibited an ultimate compression stress of ~1.5 GPa with ductility averaging ~25% strain. Near-net shape turbine blades with cooling passages can be demonstrated, and processing strategies to tailor tensile will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |