| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2024
|
| Presentation Title |
Alloy Designs and Manufacturing of High Temperature Mo-Si-B Alloys |
| Author(s) |
John H. Perepezko, Dan Thoma, Longfei Liu, Fan Zhang, Liam Wood, Phalgun Nelaturu |
| On-Site Speaker (Planned) |
John H. Perepezko |
| Abstract Scope |
To address the need to extend the high temperature capability of structural alloys, refractory metal alloys are receiving a renewed attention. As part of the ARPA-E ULTIMATE program alloys in the Mo-Si-B system are being developed along with an additive manufacturing process including alloy reaction synthesis for component fabrication. With guidance from computational thermodynamics additions of Ti have been applied to reduce the alloy density to 9 gm/cm3 while also lowering the Si solubility in Mo to improve the ductility. The designed alloy shows a compressive strength of 1.6 GPa and 20% strain. However, the Ti addition compromises the oxidation resistance due to the degradation of the protective amorphous borosilica surface layer by TiO2 formation during oxidation exposure. The application of a coating by pack cementation co-deposition of Si and B yields a robust oxidation resistance with self-healing capability from 800℃ to 1300℃. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Surface Modification and Coatings |