Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 222, Issue -, Pages 142-147Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2015.03.012
Keywords
Electromagnetic stirring; Refining; Solidification; Al-Si alloy
Funding
- Chinese Academy of Sciences
- National Natural Science Foundation of China [51474201]
- National Basic Research Program of China [2011CBA00700]
- Science Fund of Institute of Plasma Physics, Chinese Academy of Sciences [095YZ31222, Y35QT10894]
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Aiming at developing a Si solidification purification process in the Al-Si alloy system, series of experiments on the effect of electromagnetic stirring on refining of metallurgical grade Si(MG-Si) were carried out. By the use of electromagnetic stirring, an increase of size and average mass of primary Si flakes with the increasing voltage of the electromagnet were obtained. Impurity elements formed intermetallic compounds with Al and Si, such as Al7Fe2Si(alpha phase) and Al5FeSi(beta phase). An intermetallic compound type transformation with electromagnetic stirring was observed. The refined Si under the alternative electromagnetic field contains much lower B and P than those without the electromagnetic stirring. An apparent segregation coefficient was introduced to describe the segregation between solid Si and Al-Si melt. The apparent segregation coefficients of B and P are determined to be 0.37 and 0.17, respectively, when the voltage of the electromagnet is 210V and cooling rate is 0.5 K min(-1). (C) 2015 Elsevier B.V. All rights reserved.
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