INVESTIGATION OF REFINEMENT OF PRIMARY SILICON IN Al-18Si ALLOY UNDER  A GRADIENT HIGH MAGNETIC FIELD

Acta Metall Sin

2007, Vol. 43

Issue (5): 521-528 DOI:

Research Articles

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INVESTIGATION OF REFINEMENT OF PRIMARY SILICON IN Al-18Si ALLOY UNDER A GRADIENT HIGH MAGNETIC FIELD

Fang-wei JIN;;;;

昆明云南农业大学工程技术学院

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Fang-wei JIN. INVESTIGATION OF REFINEMENT OF PRIMARY SILICON IN Al-18Si ALLOY UNDER A GRADIENT HIGH MAGNETIC FIELD. Acta Metall Sin, 2007, 43(5): 521-528 .

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Abstract The effects of a gradient high magnetic field on the morphology and distribution of the primary silicon grains in Al-18Si alloy have been investigated experimentally. It is shown that in the gradient high magnetic field the primary silicon phase grains, which are large plate-like or five-star-like in the case of solidification without magnetic field, are accumulated on the top of the specimen and refined remarkably with the morphology of polygonal or nodular shapes when the alloy solidifies from the semisolid state. In the segregated layer of the silicon, the distribution of the silicon grains is homogeneous. The size of the primary silicon grains decreases and the grain number density rises with the increase of the magnetic strength maintaining the magnetization force unchangeable. It seems that the high magnetic field influences the diffusion of silicon. Theoretical models have been proposed to explain the refining and the distribution of the silicon grains.

Key words: high magnetic field solidification Al-Si alloy

Received: 20 September 2006

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