Al-Si 합금의 강도에 미치는 Si 의 영향 = A Study on the Effect of silicon Content on Mechanical Properties of Al-Si Alloy

국문 초록 (Abstract)

Al-Si 合金에서 硅素含量을 5%에서 25%까지 변화시켜 기계적 성질의 변화를 考察하였으며 添加元素인 Cu, Ni, Mg의 영향과 改良處理元素인 Na, P의 영향도 아울러 검토했다.
本 實驗에서 얻은 結論은 다음과 같다.
1) Na은 初晶硅素를 微細化시키며 球狀化시키고 基地組織을 강화하며 P은 初晶硅素를 微細化시키는데 그 효과가 현저했다.
2) 인장강도는 공정점 부근에서 최대값을 가지며 Mg 첨가와 Na처리로 현저한 향상을 나타냈다.
3) 규소함량에 따른 기지조직의 경도변화는 거의 없으나 Mg 첨가의 경우 크게 향상되며 Na 개량처리는 경도를 더욱 증가시켰다.

다국어 초록 (Multilingual Abstract)

In Al-Si alloy, the variation of mechanical properties with silicon contents was investigated the silicon content being varied from 5% to 25%, and the effects of additives and refining elements were also studied.
The results obtained are as follows:
1) Sodium treatment made the primary silicon crystals refined and spheroidized, and made the matrix structure intensified. The effect of P treatment on refining primary silicon crystals was greater than that of Na.
2) Tensile strength showed the maximum value at near the eutectic composition and was improved considerably by addition of Mg and treatment with Na.
3) The variation of matrix hardness with silicon contents was not perceptible and the hardness was improved by addition of Mg and treatment with Na.