稀土Ce对铸造铝铜合金ZL201组织的影响  

Effect of Ce on Structure of ZL201 Alloy

作　　者：米国发[1] 刘彦磊[1] 龚海军[1] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《热加工工艺》2009年第1期11-15,共5页Hot Working Technology

基　　金：河南省杰出人才创新基金资助项目(0621000700)

摘　　要：在不对合金进行其它精炼处理的前提下,通过Ce对ZL201合金的变质处理,发现Ce加入量、加入温度和保温时间的不同对ZL201合金晶粒度和显微组织有很大影响。合金晶粒和组织随着Ce加入量的增加而变细,超过0.5%后产生过变质,晶粒变粗、组织变差,二次枝晶间距却随稀土含量的增加而减小;稀土元素的加入同时起到了除气、除杂的作用,随着稀土的加入,合金的凝固表面质量越来越好;在720℃下保温30min变质效果最好,温度过高或过低,时间过长或过短都会使合金产生变质衰退或不足的现象;稀土变质合金对于浇注过程中的冷却速度也很敏感,冷却越慢,合金的晶粒越大。The modification of Ce on structure of ZL201 alloy without any refinement was researched. The grain size and microstructure of ZL201 were affected by the three factors of adding content,adding temperature and holding time of Ce. The grain size and structure were refined with the increase of Ce addition. When the content of Ce was over 0.5%,the over modification happened,the grains got coarse and the structure got bad. However,the secondary dendritic space of alloy would be shortened with the increase of Ce ...

关 键 词：变质处理 晶粒度 显微组织 二次枝晶间距 

分 类 号：TG27[金属学及工艺—铸造]