Effect of High Longitudinal Magnetic field on the Microstructure of Directionally Solidified Al-4.5%Cu Alloy

Acta Metall Sin

2006, Vol. 42

Issue (2): 147-152 DOI:

Research Articles

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Effect of High Longitudinal Magnetic field on the Microstructure of Directionally Solidified Al-4.5%Cu Alloy

LI Xi

上海大学材料学院

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LI Xi. Effect of High Longitudinal Magnetic field on the Microstructure of Directionally Solidified Al-4.5%Cu Alloy. Acta Metall Sin, 2006, 42(2): 147-152 .

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Abstract An investigation into the microstructure in directional solidified hypoeutectic Al-4.5Cuwt.％alloys under a longitudinal magnetic field shows that the field has a great influence on the dendritic arrays. The field causes severe distortion in the dendritic array morphology in the mushy zone and disappeared below the eutectic isotherm at lower growth speed R=5µm/s, as opposed to the well-aligned dendritic crystals in the absence of the field; At the growth speed R=50µm/s and a temperature gradient in the liquid of 38K/cm, the alignment structure forms and the crystal direction <111> turns to the direction of the magnetic field, as opposed to the dendrite growth along the crystal direction<100>. It has also been found the field causes the increase of primary dendrite arm spacing at the growth speed R=100µm/s, Above phenomena is analysed on the base of the TEMHD theory and crystal.magnetic anisotropy theory.

Key words: high magnetic field dendritic growth Al-4.5Cu wt.％ directional solidification

Received: 31 May 2005

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