About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
A Metastability Approach to Drive Structural Transformations and Strengthening in Nb-based BCC alloys |
| Author(s) |
Ravit Silverstein, Julia T Pürstl, Florent Mignerot, Nicolò M della Ventura, Tresa M Pollock, Daniel S Gianola |
| On-Site Speaker (Planned) |
Ravit Silverstein |
| Abstract Scope |
Balancing strength and ductility in BCC refractory multi-principal element alloys (RMPEAs) has drawn attention to the roles of chemical ordering, phase decomposition, and complexions in dislocation behavior. An emerging strategy involves incorporating small amounts of oxygen interstitials (~1 at.%) into metastable BCC alloys to accelerate the kinetics of structural transformation and improve mechanical properties. This study examines these effects in BCC Nb–Ti alloys, serving as a model system for understanding these phenomena in more complex, multi-component systems. Through 4D-STEM and small-scale mechanical testing, we track the effects of phases and misfit strains on dislocation dynamics to elucidate the fundamental deformation mechanisms. Our findings demonstrate that all microstructural features follow the Burgers path either through direct transformation to α-HCP or via Burgers-related intermediate phases. We correlate these effects with mechanical performance using coherency strains and structural wavelength-based strengthening models that provide insights for the design of future multi-component refractory alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Phase Transformations |