稀土元素和浇注温度对Al-4.5Cu合金初生相形貌的影响  

Effects of RE and Pouring Temperature on Morphology of Primary Phase in Al-4.5Cu Alloy

作　　者：周全[1] 陈乐平[1] 尹健[1] 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《热加工工艺》2011年第3期36-38,共3页Hot Working Technology

基　　金：江西省自然科学基金资助项目(2008GQC0035)

摘　　要：研究了不同稀土(RE)加入量和浇注温度对Al-4.5Cu合金初生相形貌的影响。结果表明:添加微量的RE并降低合金的浇注温度,可获得非枝晶组织的半固态Al-4.5Cu合金坯料;添加了0.5%RE的合金,随浇注温度的降低,其初生相由树枝晶转变成细小的球状晶粒;当浇注温度为660℃,随RE加入量的增加,合金的初生相由等轴枝晶转变成细小的蔷薇状晶体,最后转化为球状晶粒;未添加RE的合金,随浇注温度的下降,其初生相由发达的树枝晶转变成等轴枝晶。The effects of addition amount of RE and pouring temperature on the morphology of primary phase in Al-4.5Cu alloy were investigated.The results show that semi-solid Al-4.5Cu alloy with non-dendrite structure can be obtained by adding tiny RE and controlling pouring temperature.With the decrease of pouring temperature,primary phase in the alloy with 0.5% RE changes from dendritic crystal to spherical crystal.When pouring temperature is 660 ℃,with the increase of RE addition,dendritic crystal changes from equiaxed crystal to rose-shape crystal,and transforms into spherical crystal.As pouring temperature decreasing,primary phase in the alloy without RE addition changes from large dendritic crystal to equiaxed crystal.

关 键 词：AL-4.5CU合金 稀土元素 浇注温度 

分 类 号：TG292[金属学及工艺—铸造]