Abstract: The influence of Sr on the solidification process of Al-Si alloys was systematically investigated by differential thermal analysis. The results obtained show that Sr in the meit raised the primary α-Al nucleation temperature and the temperature of eutectic solidification, and retarded the primary silicon nucleation. It is, therefore, possible that rich Al phase is the leading crystallization phase during the Al-Si eutectic alloys solidification.

Key words: Al-Si alloys, Solidification process, Influence of Sr