Distribution of Si particles in hypereutectic aluminum alloy tubes prepared under electromagnetic field
(1.Laboratory of Advanced Materials, Department of Materials Science and Engineering,Tsinghua University, Beijing 100084, China
2.Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
3.北京市清华大学材料科学与工程系先进材料实验室)
2.Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
3.北京市清华大学材料科学与工程系先进材料实验室)
Abstract: Hypereutectic Al-Si alloy tubes were produced by centrifugal casting process using an electromagnetic field (EMF). A gradient distribution of the primary Si particles was formed along the tube thickness direction. In the absence of EMF the primary Si moves to inner periphery with increasing rotation speed. The distribution of primary Si can be controlled by the EMF. With increasing electromagnetic field intensity, the primary Si moves from the inner periphery to the outer periphery of the tubes. Most of the primary Si can be driven to the outer if the electromagnetic field intensity is increased to a certain value. It is found that the particle distribution and local volume fraction vary with both the rotation speed and the electromagnetic field intensity.
Key words: Al-Si alloy; centrifugal casting; electromagnetic field (EMF); gradient distribution