About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Monte Carlo Simulation and Three-dimensional Diffuse Scattering Study of Martensitic Transformation |
| Author(s) |
Xiaoxu Guo, Yongmei M. Jin, Yu U. Wang, Yang Ren |
| On-Site Speaker (Planned) |
Yongmei M. Jin |
| Abstract Scope |
A quasi-spin Ising model of ferroelastic phase transition is developed and employed to perform Monte Carlo simulation of thermoelastic martensitic transformation. The quasi-spin variable associated with the lattice sites characterizes the local unit cells of the orientation variants of the ground-state martensite phase, which interact with each other through long-range elastic interactions. The simulation study focuses on the intrinsic behaviors of a defect-free crystal that undergoes cubic-to-tetragonal martensitic transformation. Diffuse scattering is calculated from the simulated microstructures during the transformation. It is shown that the diffuse scattering in the pre-martensitic austenite state results from the spatial correlation of the atomic-scale heterogeneous lattice displacements and manifests the displacement short-range ordering. The effects of temperature, elastic anisotropy, and shear modulus softening on diffuse scattering, displacement short-range ordering, and martensitic transformation are investigated. The simulated diffuse scattering is compared and agrees with the complementary synchrotron X-ray single-crystal diffuse scattering experiment of Ni-Mn-Ga alloys. |
| Proceedings Inclusion? |
Planned: |