摘要
采用光学显微镜(OM)和扫描电子显微镜(SEM)等手段研究不同铜含量Zn-Cu合金的铸态凝固组织形貌以及冷却速度对包晶显微组织的影响。结果表明,Zn-2%Cu合金中存在六角花瓣状η相和板条类层片状η相两种结构,类层片状η相的平均层片间距为8.64μm,随着冷却速度的提高,板条类层片状η相的数量增加幅度较大。Zn-3%Cu、Zn-4%Cu过包晶合金的凝固组织都是由初生ε相、包晶η相和基底η相共同构成,随着冷却速度的提高,初生ε相的枝晶壁更发达,包晶η相的厚度更薄。
Solidification morphologies of as-east Zn-Cu alloys with different copper contenls in the ladder type ferrous mold were observed by optical microscope （ OM ） and scanning electron microscope （SEM）. The effect of cooling velocity on peritectie structures was studied. The results show that there are two types＇ structures of η phase in Zn-2%Cu alloys, which are cellular-like and plate-like lamella structures, respectively. With the cooling velocity inercasing, the quantity of plate-llke lamella structures is increased largely. The average size between lamellar spacing is about 8.64 μm. The solidified microstructure of Zn-3%Cu,Zn-4%Cu hyperperitectic alloys are both consisted of primary e phase, peritectic r/ phase and matrix r/ phase. With the increasing of cooling velocity, the primary dendrites e phase are more developed, but the layer of peritectic phase surrounding the primary phase becomes more thickening.
出处
《有色金属工程》
CSCD
北大核心
2017年第3期9-13,18,共6页
Nonferrous Metals Engineering
基金
陕西省科技厅科研基金资助(2016JM5093)
关键词
Zn-Cu包晶合金
金属阶梯铸型
包晶相
初生相
层片间距
Zn-Cu peritectic alloy
ladder ferrous mold
peritectic phase
primary phase
the lamellar spacing
