About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
From Slip to Deformation Twinning: Critical Onset Stresses in Cr-Mo-Si Solid Solutions |
| Author(s) |
Sri Rathinamani Ramdoss, Georg Winkens, Amin Radi, Gabriely Falcão, Daniel Schliephake, Alexander Kauffmann, Martin Heilmaier, Ruth Schwaiger |
| On-Site Speaker (Planned) |
Sri Rathinamani Ramdoss |
| Abstract Scope |
The need for high-temperature materials is growing to enable higher operating temperatures and improve energy conversion efficiency. Ni-based superalloys, while effective, are limited by the solvus temperature of their strengthening phases. Cr-Mo-Si alloys, particularly Cr-36.1Mo-3Si, have emerged as promising alternatives due to their combined oxidation resistance and room-temperature ductility. This study investigates Cr-XMo-3Si alloys (X = 0–60 at. %) through macroscopic compression testing at room temperature and 800 °C. With increasing Mo content, a shift in the dominant deformation mechanism from dislocation slip to deformation twinning is observed. Remarkably, deformation twinning remains active even at 800 °C, which is uncommon for BCC metals and alloys. Size-dependent plasticity was identified via nanoindentation, and strain rate sensitivity was evaluated using strain rate jump tests. These findings highlight the potential of Cr-Mo-Si alloys as high-temperature structural materials with favorable mechanical properties at low temperatures as a substantial problem of other candidate materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Other |