About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Examining the influence of multiphase evolution and elemental partitioning on mechanical behavior in Nb-V-Zr alloys |
| Author(s) |
Katharine Padilla, Caelyn Walton-Macaulay, Sam Ehrman, Rohan Mishra, Katharine M. Flores |
| On-Site Speaker (Planned) |
Katharine Padilla |
| Abstract Scope |
Refractory high-entropy alloys are promising candidates for high-temperature structural applications, but their performance is strongly governed by complex, composition-dependent microstructures. In this study, we examine the evolution and influence of multiphase microstructures in a series of Nb–V–Zr alloys with varying Nb/Zr concentrations. Nb-enriched alloys exhibit a primary BCC matrix with secondary C14 and C15 Laves phases, where Nb segregates to dendrite cores and Zr to interdendritic regions. Conversely, Zr-enriched alloys are dominated by an HCP Zr phase with similar Laves precipitates, but reversed elemental partitioning. Microhardness measurements reveal a general decrease in hardness with increasing Zr content, with a significant dependence on the dominant matrix phase. Additional characterization using high-temperature XRD, nanoindentation, and TEM aims to elucidate phase stability and interfacial structure. These results provide insight into how phase selection and compositional segregation impact mechanical behavior in RHEA systems, with implications for alloy design in extreme environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Additive Manufacturing, Phase Transformations |