Zn-Cu包晶合金凝固组织和物相演化规律  

Solidification Microstructure and Phase Evolution in Zn-Cu Peritectic Alloy

作　　者：唐玲[1] 张会[1] 张红霞 

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723003 [2]中广核工程有限公司,广东深圳518124

出　　处：《有色金属工程》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)

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.

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 

分 类 号：TG244[金属学及工艺—铸造]