Phase field simulation of a directional solidification of a ternary eutectic Mo-Si-B Alloy
Phase field simulation of a directional solidification of a ternary eutectic Mo-Si-B Alloy
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DOI：
10.1088/1757-899x/118/1/012028
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
O. Kazemi;G. Hasemann;M. Krüger;T. Halle
中科院分区：
文献类型：
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作者：
O. Kazemi;G. Hasemann;M. Krüger;T. Halle
我们提出了在恒定热梯度下三元共晶成分 (Mo-17.5Si-8B) 的 Mo-Si-B 合金的共晶相场模型。冷却速率和热梯度等工艺参数直接从区域熔化的实验过程中获得。使用各向同性模型计算平衡界面几何形状和界面迁移率。通过对Mo-Si-B三元相图进行线性化获得相平衡和其他热力学参数。我们根据 Jackson-Hunt 最小过冷间距理论研究了工艺参数对层状生长模式和层状模式稳定性的影响。为了检查模型生成的结果，他们通过实验观察到的微观结构和测量进行了验证，并显示与实验观察结果非常一致。
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.