| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Spatially Tailored Materials: Processing-Structure-Properties
|
| Presentation Title |
Oxygen-induced elemental segregation as a pathway for evolving new microstructures in IV-based BCC refractory alloys |
| Author(s) |
Ravit Silverstein, Florent Mignerot, Nicoló Maria della Ventura, Jeremiah Thomas, Julia Pürstl, Anton Van Der Ven, Carlos G Levi, Tresa M Pollock , Daniel S Gianola |
| On-Site Speaker (Planned) |
Ravit Silverstein |
| Abstract Scope |
Interstitial engineering is an emerging strategy for tailoring mechanical properties in metastable BCC refractory alloys, utilizing oxygen interstitials to induce phase transformations that enhance mechanical performance. Despite its potential, the full implications of competing phase transformations, microstructures, and their effects on dislocation interactions remain unclear. Notably, inconsistencies in reported phase instabilities and deformation mechanisms in BCC Ti alloys position the concentrated Ti-Nb alloy as an ideal system for investigating these phenomena in more complex alloys. In this study, we demonstrate that incorporating interstitials in dilute concentrations can effectively promote nanoscale architectures in Ti-Nb alloys, achieving elevated strength levels and mitigating the typical strength-toughness tradeoff. We employ phase evolution investigations, coupled with 4D-STEM and small-scale mechanical testing, to elucidate the underlying deformation mechanisms. Our findings highlight the competition between Burgers and de-Fontaine transformation pathways and propose strengthening models based on structural wavelength, providing insights into the design of high-performance refractory alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Temperature Materials, Phase Transformations |