To enhance the understanding of impurities B and P removal in the solidification purification process of the Al-30Si alloy, series of experiments were carried out to study the roles of AlB₂ and AlP in the nucleation of primary Si and the effect of electromagnetic stirring on the segregation behaviors of B and P. The results showed that the formed AlB₂ phase does not act as the nucleation site for the primary Si and tends to distribute in the eutectic Al-Si, which would not pollute the primary Si. The P content (<68 ppmw) in metallurgical silicon is not sufficient to form AlP phase before the nucleation of primary Si, and thus the AlP phase can be removed effectively as it would be pushed to the front of the solid-liquid interface during the primary Si growth. It was also found electromagnetic stirring could effectively enhance the segregation behaviors of B and P during the growth of the primary Si, where the B and P contents in the primary Si were decreased with the increase of the magnetic field intensity. The effective segregation coefficients of B and P were reduced from 0.41 to 0.23 and 0.47 to 0.3, respectively, under 25 mT magnetic field compared that without electromagnetic stirring.

为了增进对Al-30Si合金凝固纯化过程中杂质B和P去除的理解，进行了一系列实验，研究了AlB ₂和AlP在初生Si成核中的作用以及电磁搅拌对初生Si的影响。结果表明，形成的AlB ₂相并不充当初生硅的成核位点，并且倾向于分布在共晶Al-Si中，而Al-Si不会污染初生Si。冶金硅中的P含量（<68 ppmw）不足以在初生Si形核之前形成AlP相，因此可以有效去除AlP相，因为它将在固溶过程中被推到固液界面的前端。原始硅生长。还发现电磁搅拌可以有效地增强初生Si生长过程中B和P的偏析行为，其中初生Si中的B和P含量随着磁场强度的增加而降低。与没有电磁搅拌的情况相比，在25 mT磁场下，B和P的有效偏析系数分别从0.41降低至0.23和0.47降低至0.3。