一、前言 自从三十年代发现过共晶Al-Si合金加磷变质以来,各国对此开展了相当多的研究。但对于同时变质初晶Si及共晶Si组织的研究有待于进一步的深入。 为了提高和改善合金的性能,更大限度地发挥共晶Al Si合金的性能潜力,本文采用磷、混合轻稀土对Al-Si18％合金进行联合处理。据资料报导,稀土在共晶Al Si合金中,可以变质共晶组织、提高合金的高温强度,这就为选取稀士进行双重变质 I. Introduction Since the discovery of the eutectic Al-Si alloy in the 1930s, it has carried out quite a lot of researches on it. However, the study on the simultaneous modification of primary Si and eutectic Si needs to be further studied. In order to improve and improve the performance of the alloy, to maximize the performance potential of eutectic Al Si alloy, this paper uses phosphorus, mixed light rare earth Al-Si18% alloy joint treatment. According to reports, rare earth eutectic Al Si alloy, the eutectic can be modified to improve the high temperature strength of the alloy, which is the choice of rare double for metamorphism