발간논문

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Vol.13, No.1, 12 ~ 19, 1975
Title
A Study on the Refinement of Primary Silicon Crystals in a high Silicon - Aluminum Alloy (3)
남태운Tae Woon Nam, 김수영Soo Young Kim, 이상익Sang Ik Lee
Abstract
The effects of copper, magnesium, phosphorus and sulfur on the refinement of primary silicon crystals in high silicon-aluminum alloys were examined by metallography. The effects of the refinement and the subsequent heat-treatment of the alloys on the hardness, the tensile strength, the machinability were also studied. The results obtained are as follows: 1. The addition of phosphorous or sulfur after the addition of copper or magnesium was more effective to the refinement of the primary silicon crystals than that of copper or magnesium only. 2. The tensile-strength and the machinability were improved by the refinement of primary silicon crystals and the subsequent heat-treatment but the hardness was not affected.
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