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8.64 μm,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-cast Zn-Cu alloys with different copper contents in the ladder type ferrous mold were observed by optical microscope (OM) and scanning electron microscope (SEM). The effect of cooling velocity on peritectic 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 increasing, the quantity of plate-like 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 ε phase, peritectic η phase and matrix η phase. With the increasing of cooling velocity, the primary dendrites ε phase are more developed, but the layer of peritectic phase surrounding the primary phase becomes more thickening.
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