Separation of primary Si and impurity boron removal from Al-30% Si-10% Sn melt under a traveling magnetic field
Separation of primary Si and impurity boron removal from Al-30% Si-10% Sn melt under a traveling magnetic field
复制标题
分离%20of%20初级%20Si%20and%20杂质%20硼%20去除%20from%20Al-30%%20Si-10%%20Sn%20熔体%20下%20a%20行进%20磁场%20磁场
DOI：
10.1007/s41230-016-6036-4
复制
发表时间：
2016
期刊：
影响因子：
1.6
通讯作者：
Li Ting-ju
中科院分区：
文献类型：
--
作者：
Sun Jin-ling;Zou Qing-chuan;Jie Jin-chuan;Li Ting-ju
研究了行波磁场作用下Al-30%Si-10%Sn合金凝固过程中初晶Si相的分离和初晶Si相中硼的去除。结果表明，铸锭外围可形成初生Si的团聚层，内部组织主要由α-Al+Si和β-Sn共晶相组成。强烈的熔体流动携带着高硅含量的液相，促进了初晶Si相的生长，初晶Si相首先在坩埚内壁附近析出，且温度较低，导致初晶Si相的明显偏析。随着磁场强度的增加，可以有效地去除初晶Si相中的杂质B。电子探针（EPMA）分析结果表明，电磁搅拌条件下Al-Si-Sn合金α-Al相区B Ka线的平均强度高于正常凝固条件下的强度，表明电磁搅拌能促进初晶Si相中B的去除。
Separation of primary Si phase and removal of boron in the primary Si phase during the solidification process of the Al-30%Si-10%Sn melt under a traveling magnetic field (TMF) were investigated. The results showed that the agglomeration layer of the primary Si can be formed in the periphery of the ingot while the inner microstructures mainly consist of the eutectic α-Al+Si and β-Sn phases. The intense melt flow carries the bulk liquid with higher Si content to promote the growth of the primary Si phase which is first precipitated close to the inner wall of crucible with a relatively lower temperature, resulting in the remarkable segregation of the primary Si phase. The content of impurity B in the primary Si phase can be removed effectively with an increase in magnetic flux intensity. The results of electron probe microanalysis (EPMA) clearly indicated that the average intensity of the B Ka line in the α-Al phase region of Al-Si-Sn alloy is higher in the case of solidification under TMF than that of normal solidification condition, suggesting that the electromagnetic stirring can promote the B removal from the primary Si phase.