| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
Critical Role of Internal Stresses in the Nucleation of Nanoscale Undercooled Melts at Solid-Solid Phase Interfaces |
| Author(s) |
Kasra Momeni |
| On-Site Speaker (Planned) |
Kasra Momeni |
| Abstract Scope |
We examine the influence of elastic energy on the nucleation and dissipation of nanometer-sized intermediate melt (IM) regions at solid-solid (S1S2) phase interfaces below the melting temperature using a phase-field approach. We investigated a range of interface energy ratios (kE) and widths (kδ), finding that internal stresses mildly enhance barrierless IM nucleation and significantly alter system dynamics. Notably, mechanical effects allow the emergence of the IM where kE < 2—a condition thermodynamically infeasible without mechanical intervention—and eliminate the IM-free gap. Inclusion of mechanics notably reduces the activation energy for forming a critical IM nucleus, particularly in HMX energetic crystals, by sixteenfold. This adjustment meets the kinetic nucleation criteria, enabling thermally activated melting consistent with experimental observations for HMX and potentially clarifying behaviors in systems undergoing similar S1S2 phase transitions, such as in electronic, geological, and pharmaceutical materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, ICME |