About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2026 – A Memorial to Todd Leonhardt
|
| Presentation Title |
Microsegregation-Driven Mechanical Heterogeneity in Refractory Alloys |
| Author(s) |
Janith C. Wanni, Mikayla Obrist, Matthew Vigil, William Kunkel, Bernard Gaskey, Dan Thoma, Saryu Fensin |
| On-Site Speaker (Planned) |
Janith C. Wanni |
| Abstract Scope |
Microsegregation during solidification in multicomponent alloys leads to chemical heterogeneity and spatial variation in mechanical properties. This study integrates nanoindentation, EDS mapping, and EBSD analysis to examine property gradients across segregated dendritic structures in Ta–Mo–Nb–Ti–V alloys. Nanoindentation reveals that Ti- and V-enriched interdendritic regions exhibit hardness values up to twice as high as those of the Ta-rich dendritic cores. In contrast, the elastic modulus varies by only 10–20% across the microstructure and is generally higher in the dendritic regions. These variations are attributed to solid solution strengthening, influenced by atomic size and modulus mismatch. Kernel Average Misorientation analysis indicates negligible local misorientation, confirming that the hardness and modulus variations are compositionally driven rather than strain-induced. A CALPHAD-informed model is utilized to correlate local composition with predicted hardness. This integrated approach offers a predictive framework for understanding and engineering microstructure-dependent property gradients in complex refractory alloys. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Characterization, High-Entropy Alloys, Mechanical Properties |