|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Metastability, Coarsening, and Strengthening Induced by Oxygen Interstitials in BCC Ti-Nb Alloys
||Ravit Silverstein, Florent Mignerot, Nicoló Maria della Ventura, Carlos G. Levi, Tresa M. Pollock , Daniel S. Gianola
|On-Site Speaker (Planned)
The design of refractory BCC alloys with interstitial elements, particularly those based on group number IV, reveals a unique combination of mechanical properties. Interstitial incorporation leads to phase instabilities in the BCC parent structure, resulting in a rich variety of new structures and microstructures. Compositional variance, coarsening behavior, and their corresponding effects on mechanical properties are actively being studied, but key mechanisms are not fully understood. The presence of Ti and Nb in most refractory multi-principal element alloys (RMPEs) makes their binary system attractive for establishing a fundamental understanding of the more complex RMPEs. This work elucidates the role of oxygen, in dilute concentration (~1 at%), in mediating phase evolution and transformation pathways in Ti-Nb alloys. Small-scale mechanical testing that can target specific O-mediated microstructures reveals exceptional properties with hardnesses and tensile yield strengths as high as 7 GPa and 3 GPa, respectively. Potential deformation mechanisms will be discussed.
||Planned: Metallurgical and Materials Transactions