Abstract
Simulation of diffusion-controlled phase growth has long been practiced by strictly following Fick-Onsager-Darken law for diffusion under the assumptions of local equilibrium and sharp interface. However, a major pain point is the difficulty of finding operating tie-lines at the interface for multi-component alloys. In the present work, a new scheme is presented to deal with this difficulty by extending from Larsson and Reed scheme (Larsson and Reed, Acta Mater. 56 (2008) 3754–3760). The flux balance equations are rewritten to enhance the accuracy and fulfilled from the very beginning of simulations. The simulation results of the Fe-Mn-Mo and Fe-C-Mn ternary systems, as well as high-order systems, demonstrate the applicability and robustness of the new scheme. The simulation of the Fe-C-Mn system reveals the details of the early stages of the bcc phase growth, showing a shrink of bcc before its growth with two growth modes smoothly switched.
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