Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-04-01

Journal: MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING

Included Journals: Scopus、EI、SCIE

Volume: 61

Page Number: 79-84

ISSN: 1369-8001

Key Words: Al-Si alloy; Direct electric current; Joule heat; Convection; Boron redistribution

Abstract: The effect of direct electric current on redistribution and microstructure of primary silicon in Al-Si melt during the solidification refining process was studied. Electric current generates a Joule heat, which slows down the cooling rate of the furnace. The precipitated area of primary silicon decreases from 100% to 36.67% with the increase of current density from 0 A/m(2) to 1.5x10(6) A/m(2). Furthermore, direct current causes a convection leading to the migration of primary silicon in the opposite direction of electric field, which forms the accumulation area. The morphologies of primary silicon and the redistribution of B impurity were investigated under the effect of electric current.