Effect of DC and AC Magnetic Fields on the Solidification Structure of Commercially Pure Aluminium

• Published in: Advanced materials research Vol. 583; pp. 387 - 390
• Main Authors: Jiang, Dan Dan, Ban, Chun Yan, Liu, Lian, Cui, Jian Zhong
• Format: Journal Article
• Language: English
• Published: Trans Tech Publications Ltd 01.01.2012
• Subjects: Pure Aluminium; Intermetallic; Morpholoy; Magnetic Field; Distribution
• ISSN: 1022-6680; 1662-8985; 1662-8985
• DOI: 10.4028/www.scientific.net/AMR.583.387

The effect of DC and AC magnetic fields on the macrostructure, morphology and distribution of the iron-containing intermetallics in the commercially pure Al was investigated. It is found that, at a cooling rate of 3°C/min, the grain is very coarse when the alloy solidifies both with and without magnetic fields. Comparing with the sample solidifies without magnetic field, the solidification structure has almost no change when it solidifies under DC magnetic field, while AC magnetic field changes the solidification structure obviously and makes grains show radial columnar crystals. The intermetallics is dominated by long needle-like phase when the sample solidifies under the condition of no magnetic field. Under AC magnetic field, the intermetallics is refined and accumulated towards the center of sample, and the amount of bone-like α-AlFeSi phase is increased remarkably. The mechanism of the effect of magnetic fields was discussed.