稀土对铸造铝铜合金流动性和热裂倾向性的影响

The Effects of Rare Earth Elements on The Fluidity And Tendency on Hot Craking of Al Cu Cast Alloy

研究了富Ｃｅ混合稀土对铸造铝铜系高强度ＺＬ２０１Ａ合金的流动性和热裂倾向性的影响。结果表明，稀土能不同程度地提高合金的流动性和降低合金的热裂倾向性，明显地提高合金的铸造性能。分析表明，合金流动性的提高和热裂倾向性的降低，主要是由于稀土的加入使合金在凝固过程中枝晶细化，在凝固后期枝晶的联生增强。

Some trace content of RE(Ce) can remarkably increase the fluidity and decrease the tendency of hot cracking of Al Cu cast alloy. The existing of RE(Ce) makes the size of dendrites fine and increase the interdendritics strength at the later stage of solidification.