발간논문

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Vol.12, No.2, 164 ~ 171, 1974
Title
Study on the Refinement of Primary Silicon Crystals in a high Silicon - Aluminum Alloy (2)
남태운 , 김수영 Tae Woon Nam , Soo Young Kim
Abstract
The effects of magnesium addition, pouring temperatures, holding time and the double treatment together with sulfur on the refinement of primary silicon crystals in high silicon-aluminum alloys were examined by metallography, X-Ray diffraction and EPMA line analysis and compared with those of copper-treatment. The results obtained are as follows: 1) The refining could be achieved by addition of less than 1% magnesium. 2) The refining effect was observed to increase with increasing pouring temperature. 3) The longer holding time turned out to lower the refining effect. 4) The refining effect by the double treatment together with sulfur was better than that of the single treatment by magnesium. 5) The addition of magnesium and the addition of copper promoted the growth of silicon with feathering and plate-like silicon respectively.
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