Design criteria for single-phase non-equiatomic refractory multiprincipal element alloys from the Nb-Ti-Zr system.
Saved in:
| Title: | Design criteria for single-phase non-equiatomic refractory multiprincipal element alloys from the Nb-Ti-Zr system. |
|---|---|
| Authors: | Lech, Sebastian1,2 (AUTHOR), Hattrick-Simpers, Jason3 (AUTHOR), Anber, Elaf A.1 (AUTHOR), Waters, Michael J.4 (AUTHOR), Joress, Howie5 (AUTHOR), Sur, Debashish6 (AUTHOR), Holcombe, Emily1 (AUTHOR), Rondinelli, James M.4 (AUTHOR), Scully, John R.6 (AUTHOR), Taheri, Mitra L.1 (AUTHOR) mtaheri4@jhu.edu |
| Source: | Materials & Design. Dec2025, Vol. 260, pN.PAG-N.PAG. 1p. |
| Subjects: | High-entropy alloys, Heat resistant alloys, Combinatorial chemistry, Oxidation, Magnetron sputtering, Alloys |
| Abstract: | [Display omitted] • Design criteria for stable, single-phase refractory high entropy alloys from Nb-Ti-Zr system are established. • Combinational synthesis enabled screening through large portion of the Nb-Ti-Zr system. • Dissolved oxygen is the primary factor destabilizing the desired single-phase BCC structure. • Ti-rich compositions had higher oxygen tolerance than Zr-rich ones, despite similar oxygen solubility. Refractory high entropy alloys (RMPEAs) hold promise as candidate materials for high-temperature applications challenging widely used nickel-based superalloys. RMPEAs application is currently limited by their low structure and phase stability in the presence of oxygen, which can be improved by single-phase alloy design. This study establishes design criteria for achieving single-phase, non-equiatomic RMPEAs through a systematic exploration of the Nb-Ti-Zr compositional space. Using combinatorial synthesis via magnetron co-sputtering and high-throughput characterization, we map phase stability across a broad compositional range. We identify a stable single-phase BCC region for compositions containing 19.5–55 at.% Nb, 43–59 at.% Ti, and less than 30.5 at.% Zr. Monte Carlo simulations were used to predict the phase formation at high temperatures along with electron microscopy revealing phase segregations at high-Zr compositions, exploring the role of soluble oxygen in phase formation. Our findings provide a foundation for the rational alloy design, explain the effect of each element, and pave a path for further exploration and modification of the identified compositional space. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
Be the first to leave a comment!
