| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2020
|
| Presentation Title |
Seeking Toughness in Mo-Si-B: Composites of Stable Oxides |
| Author(s) |
Peter E. Marshall, Sharvan Kumar, Xiang Yu, Alex Jackson |
| On-Site Speaker (Planned) |
Peter E. Marshall |
| Abstract Scope |
Molybdenum-silicon-boron materials with a metallic matrix are candidates for high temperature structural applications requiring oxidation resistance, strength, and toughness. Mo-Si-B itself has a high ductile to brittle transition temperature below which the brittle fracture behavior is problematic. The possibility of improved toughness at these lower temperatures is explored through the addition of thermodynamically stable oxides as a major dispersed phase. Mechanisms will be discussed including extrinsic toughening and changes in the solid solution chemistry. Utilizing powder processing for this composite allows for considerable flexibility in the overall composition and that of the individual phases. Of particular importance are the overall silicon and boron concentrations as well as their ratio in the intermetallic phases. Through this composition selection, the oxidation resistance and creep strength remain similar to other Mo-Si-B alloys. Additional results on the microstructural dependence of these properties will be presented. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |