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Indexed by:期刊论文

Date of Publication:2016-07-01

Journal:CHINA FOUNDRY

Included Journals:SCIE、ISTIC

Volume:13

Issue:4

Page Number:284-288

ISSN No.:1672-6421

Key Words:traveling magnetic field; Al-Si-Sn alloy; boron; solidification refining

Abstract: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 alpha-Al+Si and beta-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 alpha-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. Key words: traveling magnetic field; Al-Si-Sn alloy; boron; solidification refining