About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Thermodynamics and Kinetics of Alloys
|
Presentation Title |
Microstructural Design via Spinodal-mediated Phase Transformation Pathways in High-entropy Alloys (HEAs) Using Phase-field Modelling |
Author(s) |
Kamalnath Kadirvel, Shalini Roy Koneru, Hamish Lugard Fraser, Yunzhi Wang |
On-Site Speaker (Planned) |
Kamalnath Kadirvel |
Abstract Scope |
Multi-phase HEAs have exhibited superior and unprecedented properties based on the relative arrangements between the co-existing phases. It becomes crucial to identify the various parameters that influence microstructural topology. In this work, we considered a spinodal-mediated phase decomposition of single phase disordered solid solution into a mixture of ordered and disordered solid solutions. We simulated the possible microstructures using phase-field modelling by varying equilibrium volume fractions, modulus mismatch between the co-existing phases, and the free energy surfaces. We observed that topology of the free energy surface is one of the critical parameters in determining the microstructure that is ignored in the existing literature. We focus on the following morphological characteristics: bi-continuous microstructures vs. precipitates + matrix microstructures, ordered matrix + disordered precipitates vs. disordered matrix + ordered precipitates, and the discreteness of the precipitate phase. Our parametric study may help in microstructural design of multi-phase HEAs. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Phase Transformations, High-Entropy Alloys |