title: Effects of a high-gradient magnetic field on the migratory behavior of primary crystal silicon in hypereutectic Al-Si alloy.
abstract: The migration of primary Si grains during the solidification of Al-18 wt%Si alloy under a high-gradient magnetic field has been investigated experimentally. It was found that under a gradient magnetic field, the primary Si grains migrated toward one end of the specimen, forming a Si-rich layer, and the thickness of the Si-rich layer increased with increasing magnetic flux density. No movement of Si grains was apparent under a magnetic field below 2.3 T. For magnetic fields above 6.6 T, however, the thickness of the Si-rich layer was almost constant. It was shown that the static field also played a role in impeding the movement of the grains. The primary Si grains were refined in the Si layer, even though the primary silicon grains were very dense. The effect of the magnetic flux density on the migratory behavior is discussed.
authors.affiliation: Department of Materials Science and Engineering, Shanghai University, Box 275, 149, Yan-Chang Road, Shanghai 200072, People's Republic of China.
authors.forename: Fangwei
authors.initials: F
authors.lastname: Jin
authors.affiliation: Department of Materials Science and Engineering, Shanghai University, Box 275, 149, Yan-Chang Road, Shanghai 200072, People's Republic of China.
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Ren
authors.affiliation: Department of Materials Science and Engineering, Shanghai University, Box 275, 149, Yan-Chang Road, Shanghai 200072, People's Republic of China.
authors.forename: Weili
authors.initials: W
authors.lastname: Ren
authors.affiliation: Department of Materials Science and Engineering, Shanghai University, Box 275, 149, Yan-Chang Road, Shanghai 200072, People's Republic of China.
authors.forename: Kang
authors.initials: K
authors.lastname: Deng
authors.affiliation: Department of Materials Science and Engineering, Shanghai University, Box 275, 149, Yan-Chang Road, Shanghai 200072, People's Republic of China.
authors.forename: Yunbo
authors.initials: Y
authors.lastname: Zhong
authors.affiliation: Department of Materials Science and Engineering, Shanghai University, Box 275, 149, Yan-Chang Road, Shanghai 200072, People's Republic of China.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Yu
keywords: Al-Si alloy; gradient magnetic field; high magnetic field; magnetization force; migration; solidification