| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
Microstructure evolutions in Ni-based superalloys under complex creep loadings |
| Author(s) |
Yann M. Le Bouar, Maeva Cottura, Alphonse Finel, Benoit Appolaire |
| On-Site Speaker (Planned) |
Yann M. Le Bouar |
| Abstract Scope |
The phase field method has emerged as the most powerful method for modelling microstructure evolutions during phase transformations, particularly when elastic coherency stresses are generated in solids. However, in many materials, microstructural changes are coupled with plasticity. This is particularly the case for high temperature creep in nickel based superalloys.
In this work, a three dimensional phase field model is coupled to a crystal plasticity model based on dislocation densities. This model includes both the anisotropy and the size dependence of the plasticity, which is expected when the plasticity is confined to a region smaller than a few microns. Several creep conditions are considered, such as tensile loadings along the [001], [011] and [111] directions, as well as shear loadings. The anisotropy of the rafting and its sensitivity to small misorientations is discussed, and the relative importance of elastic and plastic driving forces is analyzed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Phase Transformations, Modeling and Simulation |