About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Microstructural Evolution and Strengthening Mechanisms in Ni₆₃.₂V₃₆.₈ Alloy with Ni₂V Precipitation |
| Author(s) |
Pedro Oliveira, Caio Martins, Ed Pickering, Nelson Neto, Gustavo Bertoli, Julio Spadotto, David Silva, Angelo Andreoli, Michael Kaufman, Francisco Gil Coury |
| On-Site Speaker (Planned) |
Francisco Gil Coury |
| Abstract Scope |
An alloy with composition Ni₆₃.₂V₃₆.₈ alloy was designed via first-principles calculations to stabilize a single-phase FCC structure with high solid-solution strengthening. It exhibits mechanical properties comparable to nickel-based superalloys and further strengthening is possible through precipitation of the ordered Ni₂V phase. This study investigates Ni₂V precipitation under varying cooling rates using in situ X-ray diffraction and dilatometry. Tensile tests were used to assess how different amounts of Ni₂V influenced mechanical behavior. Microstructural analysis via EBSD, EDS, and TEM revealed that Ni₂V with the Pt2Mo body-centered orthorhombic structure precipitates both in the matrix and at grain boundaries through what appears to be a massive transformation, progressively replacing the FCC matrix. The presence of Ni₂V enhances strength up to a critical volume fraction, beyond which brittleness compromises performance. These findings demonstrate that the mechanical properties of Ni₆₃.₂V₃₆.₈ can be tuned by controlling Ni₂V precipitation, offering a balance between strength and ductility. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Phase Transformations |