About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Additive Manufacturing of Refractory Metallic Materials
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| Presentation Title |
Tailoring Phase Evolution in Additively Manufactured Nb-Ti-V-Zr Refractory Alloys via Controlled Deposition Order |
| Author(s) |
Nur Aziz Octoviawan, Katharine Padilla, Pravan Omprakash, John Cavin, Rohan Mishra, Katharine Flores |
| On-Site Speaker (Planned) |
Nur Aziz Octoviawan |
| Abstract Scope |
Deposition sequence of elemental powders is a critical parameter in Direct Laser Deposition (DLD) of Nb-Ti-V-Zr refractory multi-principal element alloys, governing thermal history, elemental mixing, and phase evolution. This study systematically investigates how elemental deposition order influences solidification dynamics and phase formation, with direct consequences for microstructure development, compositional homogeneity, and phase selection.
Experimental results reveal that initiating builds with high-melting temperature elements (Nb, V) causes delayed mixing and compositional gradients in initial layers. Conversely, starting with lower-melting temperature elements (Ti, Zr) facilitates homogeneous mixing and equiaxed grain formation. Microstructural analysis (SEM/EDS/XRD) confirms deposition order critically controls BCC phase stability and distribution while dictating tendencies for phase separation and localized enrichment.
Nanoindentation mapping demonstrates corresponding spatial variations in hardness and elastic modulus, directly correlating with microstructural features. These findings establish deposition sequence as a fundamental lever for controlling phase evolution pathways and tuning mechanical performance through process design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Entropy Alloys, Phase Transformations |