About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2026 – A Memorial to Todd Leonhardt
|
| Presentation Title |
Interstitial-mediated Phase Decomposition in Chemically Complex Group IV-Based Refractory Alloys |
| Author(s) |
Israel Reimer, Nicolò Maria della Ventura, Arda Genc, Ravit Silverstein |
| On-Site Speaker (Planned) |
Israel Reimer |
| Abstract Scope |
Body-centered cubic refractory multi-principal element alloys (BCC-RMPEAs) exhibit excellent high-temperature strength but are limited by a persistent strength-ductility trade-off. This work demonstrates interstitial-mediated phase decomposition as a pathway to engineer hierarchical microstructures that mitigate this limitation. Using TiNb alloy and a Ti-Nb-based quinary RMPEA as model systems, we demonstrate that dilute interstitial additions (~1 at%) can be used to template interfacial morphologies driven by diffusion routes and the degree of transformation.
In TiNb alloys, interstitial additions induce a modulated composite with nanodomains and grain boundary templated interconnected lamellar architecture, resulting in a strength increase while preserving isotropic response. In the more chemically complex alloy, a similar effect arises, albeit through different mechanisms, where a pseudo-lamellar morphology forms intragranularly. Understanding distinctions in coarsening mechanisms is critical for advancing alloy design. Using 4D-STEM, we resolve sub-nanoscale structural and elastic strain heterogeneities that underpin a versatile paradigm for tailoring phase decomposition. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Entropy Alloys, High-Temperature Materials |