Phase field simulation of a directional solidification of a ternary eutectic Mo-Si-B Alloy

18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium

Kazemi, O.^1 ; Hasemann, G.^1 ; Krüger, M.^1 ; Halle, T.^1

Institut für Werkstoff- und Fügetechnik, Otto-von-Guericke-Universität Magdeburg, P.O. Box 4120, Magdeburg

D-39016, Germany^1

关键词: Experimental procedure;    Interface geometry;    Interface mobility;    Phase-field simulation;    Process parameters;    Ternary eutectic composition;    Ternary phase diagrams;    Thermodynamic parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/118/1/012028/pdf
DOI  :  10.1088/1757-899X/118/1/012028

来源: IOP

【 摘 要 】

We present a eutectic Phase-Field Model for a Mo-Si-B alloy at ternary eutectic composition (Mo-17.5Si-8B), under a constant thermal gradient. The process parameters like cooling rate and thermal gradient were obtained directly from the experimental procedure of zone melting. The equilibrium interface geometries and interface mobility were calculated using an isotropic model. The phase equilibria and the other thermodynamic parameters are obtained by linearizing the Mo-Si-B ternary phase diagram. We have investigated the effect of process parameters on the lamellar growth pattern and lamella pattern stability with respect to the Jackson-Hunt minimum undercooling spacing theory. In order to examine the generated results by the model, they were validated with experimental observed microstructures and measurements and showed to be in a good agreement with the experimental observations.