About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering IX
|
| Presentation Title |
Coherent Precipitation of Cr23C6 in an FCC Cr-Co-Ni-Al-Ti Alloy |
| Author(s) |
Baris Yavas, Abraćo Fonseca Martins, Diego de Araśjo Santana, Francisco Gil Coury, Witor Wolf, Mark Aindow |
| On-Site Speaker (Planned) |
Baris Yavas |
| Abstract Scope |
Multi-principal element alloys (MPEAs) based on Cr-Co-Ni exhibit multiple deformation mechanisms, providing high strength, work hardening, and ductility. Additions of Al and Ti produce coherent L1₂ precipitates that further enhance strengthening. During in situ TEM heating of a Cr-Co-Ni-Al-Ti alloy, coherent intragranular Cr₂₃C₆ carbides were unexpectedly observed despite the alloy containing no carbon, suggesting a potential surface-hardening strategy through carburization. Ex situ furnace experiments demonstrated that this coherent Cr₂₃C₆ precipitation can be reproduced within the near-surface region, where the carbides coexist with L1₂ precipitates. Samples exposed to carbon exhibited significantly higher hardness than carbon-free counterparts, demonstrating the potential of controlled carburization for surface microstructural modification and strengthening. These preliminary results indicate that a scalable carburization process capable of promoting coherent near-surface Cr₂₃C₆ precipitation while suppressing protective chromium oxide formation could provide an effective surface-engineering strategy for Cr-Co-Ni-based MPEAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Surface Modification and Coatings, Characterization, |