Abstract Understanding the microstructure evolution of precipitates in metallurgical grade silicon (MG-Si) has vital research significance and industrial application. In this work, the evolution of precipitate distributions and morphology was systematically investigated in silicon during cooling through the quenching process. The results show that the micro-segregation of precipitates is mainly concentrated in the early stage of solidification, but microscopic segregation persists in the solidification stage. Al element was confirmed in the FeSi2(Al) phase in the form of dissolved Al. The Al content increases with the extension of the solidification time, but generally does not exceed 10%. The Si8Al6Fe4Ca phase gradually becomes more concentrated during the solidification process. Some of the V element in the FeSi2Ti(V) phase gradually separated into the FeSi2Ti phase during the solidification process, and the rest of the V element transformed into TiSi2 and VSi2 mixed phase. The Si–Fe–Al phase gradually increased and eventually evolved into the Si7Al8Fe5 and Si6Al9Fe4 phases with further solidification.

中文翻译：

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冶金级硅凝固过程中析出物的显微组织演变

摘要 了解冶金级硅（MG-Si）中析出物的微观结构演变具有重要的研究意义和工业应用。在这项工作中，系统研究了在通过淬火过程冷却过程中硅中析出物分布和形态的演变。结果表明，析出物的微观偏析主要集中在凝固初期，而微观偏析在凝固阶段持续存在。在 FeSi2(Al) 相中以溶解的 Al 形式确认了 Al 元素。Al含量随着凝固时间的延长而增加，但一般不超过10%。Si8Al6Fe4Ca 相在凝固过程中逐渐变得更浓。FeSi2Ti(V)相中部分V元素在凝固过程中逐渐分离为FeSi2Ti相，其余V元素转变为TiSi2和VSi2混合相。Si-Fe-Al 相逐渐增加并最终演变为 Si7Al8Fe5 和 Si6Al9Fe4 相，并进一步凝固。