摘要
将配有熔剂的碳酸稀土直接加入共晶铝硅合金，可使共晶硅完全变质，机械性能大幅度提高，并且变质具有极好的长效性。从理论上分析了碳酸稀土的变质行为。
Rare earth carbonate can be used to directly modify the eutectic Al-Si alloywhen mixed with the feuxes.The good modified structure is obtained,and the mechanicalproperties are markedey raised.The modifying period of the modifer is very long. The modifying action of rare earth carbonate is theoretically analyzed.
