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Segregation and Morphological Evolution of Si Phase during Electromagnetic Directional Solidification of Hypereutectic Al-Si Alloys

机译：过共晶Al-Si合金电磁定向凝固过程中Si相的偏析和形貌演变

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摘要

Understanding the Si segregation behavior in hypereutectic Al-Si alloys is important for controlling the micro- and macrostructures of ingots. The macrosegregation mechanism and morphological evolution of the primary Si phase were investigated during electromagnetic directional solidification (EMDS). Both numerical simulations and experimental results strongly suggested that the severe macrosegregation of the primary Si phase was caused by fluid flow and temperature distribution. Microscopic analysis showed that the morphological evolution of the Si crystal occurred as follows: planar → cellular → columnar → dendritic stages during EMDS. Based on constitutional supercooling theory, a predominance area diagram of Si morphology was established, indicating that the morphology could be precisely controlled by adjusting the values of temperature gradient (G), crystal growth rate (R), and solute concentration (C0). The results provide novel insight into controlling the morphologies of primary Si phases in hypereutectic Al-Si alloys and, simultaneously, strengthen our understanding of the macrosegregation mechanism in metallic alloys.
机译：了解过共晶Al-Si合金中的Si偏析行为对于控制铸锭的微观和宏观结构很重要。研究了电磁定向凝固（EMDS）过程中初生Si相的宏观偏析机理和形态演变。数值模拟和实验结果都强烈表明，原始硅相的严重宏观偏析是由流体流动和温度分布引起的。显微分析表明，在EMDS过程中，Si晶体的形态演化发生如下：平面→细胞→柱状→枝晶阶段。基于组织过冷理论，建立了硅形态的主要区域图，表明可以通过调节温度梯度（G），晶体生长速率（R）和溶质浓度（C0）的值来精确控制形态。该结果为控制过共晶Al-Si合金中主要Si相的形貌提供了新颖的见解，同时也加强了我们对金属合金中宏观偏析机理的理解。

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