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
周 全, 陈乐平, 尹 健
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作者单位：(南昌航空大学 航空制造工程学院, 江西 南昌 330063)
中文关键字：Al-4.5Cu合金； 稀土元素； 浇注温度
英文关键字：Al-4.5Cu alloy; RE; pouring temperature
中文摘要：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。
英文摘要：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.