About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Sintering and Related Powder Processing Science and Technologies
|
| Presentation Title |
In-Situ TEM Study of Nanoscale Sintering and Phase Evolution in High-Entropy Alloy Nanoparticles |
| Author(s) |
Daniela P. M. Fonseca, Martin P. Harmer, Ricardo H. R. Castro |
| On-Site Speaker (Planned) |
Daniela P. M. Fonseca |
| Abstract Scope |
Understanding sintering at the nanoscale is essential for advancing powder metallurgy techniques using high-entropy alloys (HEAs), yet it remains largely unexplored. This study investigates phase transformations and grain boundary segregation during in-situ sintering of CrMnFeCoNi HEA nanoparticles (NPs) synthesized via Fast Moving Bed Pyrolysis (FMBP), a method that produces contaminant-free, highly dispersed HEA-NPs. Using in-situ transmission electron microscopy (TEM) with controlled heating up to 1100 °C, we directly observed microstructural evolution including nanoparticle coalescence, neck formation, grain growth, and phase transformations. Ex-situ elemental mapping and diffraction analyses revealed composition-dependent differences in atomic diffusion and grain boundary segregation. These results uncover key mechanisms driving densification and structural evolution at the nanoscale, offering valuable insight for the design of nanoparticle-derived bulk HEAs. Overall, this work demonstrates the potential of FMBP-synthesized HEA-NPs for the development of next-generation structural materials through powder metallurgy. |