Abstract
In order to clarify the influence of Fe, Sr and Ca on shrinkage characteristics of Al-Si alloy, investigations were carried out by Tatur mold, thermal analysis and shrinkage measurement. Findings were as follows. 1) Exterior shrinkage increases and interior shrinkage decreases when Ca content increases. 2) Exterior shrinkage decreases and interior shrinkage increases when Fe content increases, in the case of 0.002∼0.006 % Ca. However, Fe content and shrinkage characteristics are not related when Ca is not contained. 3) Exterior shrinkage decreases and interior shrinkage increases when Sr content increases in the case of Sr>0.024 %. But, interior shrinkage decreases and exterior shrinkage increases when Sr content increases in the case of Sr<0.024%. 4) These results can be attributed to the increase of the semi-solidus temperature and decrease of the semi-solid formation time with the existence of the Fe compound or Sr compound.
