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About this Abstract
Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Computational Thermodynamics and Kinetics
Presentation Title Simulating Hierarchical Compositional and Thermal Structures in W-Cr Using a Fluctuation-Governed Cahn-Hilliard Model
Author(s) Peng Geng, Nicholas Julian, Qianran Yu, Enrique Martinez, Jaime Marian
On-Site Speaker (Planned) Peng Geng
Abstract Scope Tungsten-chromium (W-Cr) alloys are promising for extreme environments due to excellent high-temperature mechanical properties and corrosion/irradiation resistance. However, their large positive mixing enthalpy causes a miscibility gap, driving phase separation, which impacts performance and processing. We developed a 3D Cahn-Hilliard phase field model to simulate phase separation kinetics in the W-Cr system. The model incorporates chemical free energy, gradient energy terms, and couples concentration evolution with heat diffusion to include temperature effects. A key contribution is the explicit inclusion of temperature-scaled Gaussian noise to represent local fluctuations. We investigate the resulting microstructure evolution, particularly focusing on the influence of compositional and thermal gradients relevant to graded materials. This study provides mesoscale insights into the mechanisms governing stability and microstructure formation, aiding the design and processing of W-Cr materials.
Proceedings Inclusion? Planned:
Keywords Modeling and Simulation, Phase Transformations, Other

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