About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Interstitial–Metal Interactions: The Outsized Role of Small Atoms
|
| Presentation Title |
Oxygen-mediated phase decomposition in group IV–Nb refractory alloys |
| Author(s) |
Israel Reimer, Arturo Zuniga, Daniel Bolden, Ravit Silverstein |
| On-Site Speaker (Planned) |
Israel Reimer |
| Abstract Scope |
Refractory multi-principal-element alloys (RMPEAs) show promise for next-generation high-temperature applications, yet their high ductile-to-brittle transition temperatures limit deployment. Recent studies have shown that dilute oxygen additions raise a miscibility gap in Ti-Nb, motivating investigation of analogous thermodynamic behavior across the Group IV-Nb series. These binary systems (TiNb, ZrNb, HfNb) provide an ideal model platform for isolating the role of Group IV chemistry in governing oxygen solubility, phase stability, and decomposition kinetics, thereby establishing design principles directly applicable to complex RMPEAs. This study systematically characterizes oxygen-mediated phase decomposition across the Group IV-Nb series as a function of alloy composition, oxygen content, and annealing conditions (800-1400 °C). The underlying mechanisms are investigated by correlating chemical partitioning, phase transformations, and microstructural evolution using multidimensional diffraction analysis (4D-STEM), coupled with unsupervised machine learning approaches and complementary chemical analysis. The implications for oxygen-driven phase stability and microstructural evolution in refractory alloys are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Phase Transformations, Characterization |