About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dilute Alloying and Impurity Effects on Phase Transformations
|
| Presentation Title |
Dopant-Driven Grain Boundary Segregation in High Entropy Alloy Nanoparticles |
| Author(s) |
Daniela P. M. Fonseca, Ricardo H. R. Castro, Martin P. Harmer |
| On-Site Speaker (Planned) |
Daniela P. M. Fonseca |
| Abstract Scope |
Controlling microstructure evolution during sintering is critical to unlocking the full potential of high entropy alloy (HEA) nanoparticles for powder-based manufacturing. Yet, the role of dopant elements in driving atomic-scale transformations during thermal processing remains largely unexplored. In this work, we investigate HEA nanoparticles synthesized via fast moving bed pyrolysis (FMBP), with dilute additions of alloy elements. Using in situ heating transmission electron microscopy (TEM) coupled with energy-dispersive X-ray spectroscopy (EDS), we aim to determine whether these dopants induce chemical disorder within individual nanoparticles, promote segregation at grain boundaries, and influence overall densification behavior. These findings offer insights into how controlled minor alloying can be leveraged to tailor sintering kinetics and guide microstructure evolution in HEA systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Powder Materials |