(西北工业大学 凝固技术国家重点实验室， 西安 710072)
摘 要: 利用Bridgman法对Zn-2%Cu（质量分数）包晶合金进行了快速定向凝固实验研究， 当生长速度在1600～6400μm/s时， 得到了类似于共晶的层片状组织。 利用X射线衍射仪及透射电镜对层片状组织进行了相组成的分析， 并结合计算亚稳相图对该组织的相及组织形成规律进行了分析， 结果表明在快速凝固条件下Zn-2%Cu包晶合金中实现共生生长是可能的。
关键字: Zn-2%Cu； 包晶合金； 快速定向凝固； 层片状组织；亚稳相图
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072）
Abstract:Unidirectional solidification experiment on Zn-2%Cu(mass fraction) peritectic alloy was carried out by Bridgman method. Lamellar structure was obtained at a solidification velocity between 1600μm/s and 6400μm/s. The structure was investigated by XRD and TEM, combining with the calculated metastable phase diagram. The results show that it is possible to obtain coupled structure in Zn-2%Cu peritectic alloy by rapidly unidirectional solidification method.
Key words: Zn-2%Cu; peritectic alloy; unidirectional solidification; lamellar structure; metastable phase diagram
