| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
Microscopic Modeling of Pre-Martensitic Phenomena: Complementary Perspectives From Bottom-Up and Top-Down Approaches |
| Author(s) |
Yu U. Wang, Yongmei M. Jin |
| On-Site Speaker (Planned) |
Yu U. Wang |
| Abstract Scope |
Pre-martensitic phenomena occur in the austenitic state prior to martensitic transformation. Temperature-dependent diffuse scattering is one of the prominent precursor effects. This study employs atomic-scale microscopic models to investigate the precursor effect of the diffuse scattering, focusing on the intrinsic behaviors of defect-free crystals. Insights are gained from two complementary theories that treat martensitic transformation from bottom up (heating from martensite) and from top down (cooling from austenite), respectively. The results are discussed in relation to transverse acoustic phonons, incomplete phonon softening, heterophase fluctuations, and anomalous properties. Phonon-strain coupling and lattice instability are further analyzed using a statistical mechanics-based Gruneisen-type theory. Relevant experimental results are also discussed in light of the theoretical findings. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Modeling and Simulation, Computational Materials Science & Engineering |