摘要
采用垂直充芯连铸工艺制备了直径为12 mm、铜层厚度为2 mm的铜包铝复合材料。通过SEM、XRD和TEM对界面金属间化合物的种类和形态进行了研究。研究结果表明,Cu_/Al界面主要由层状γ_1(Cu_9Al_4)相、胞状θ(Cu_Al_2)相和α(Al)+θ(Cu_Al_2)共晶组成,特别是在界面组织中观察到残留的针状Cu_3Al_(2+x)相。通过比较γ_1(Cu_9Al_4)和ε_2(Cu_3Al_(2+x))的形核驱动力,证明了ε_2(Cu_3Al_(2+x))相优先在界面处形成。此外,完整揭示了铜包铝复合材料界面形成机理。
Copper cladding aluminum(CCA)rods with the section dimensions of12mm in diameter and2mm in sheath thickness were fabricated by vertical core-filling continuous casting(VCFC)technology.The kinds and morphology of interfacial intermetallic compounds(IMCs)were investigated by SEM,XRD and TEM.The results showed that the interfacial structure of Cu/Al was mainly composed of layeredγ1(Cu9Al4),cellularθ(CuAl2),andα(Al)+θ(CuAl2)phases.Moreover,residual acicularε2(Cu3Al2+x)phase was observed at the Cu/Al interface.By comparing the driving force of formation forε2(Cu3Al2+x)andγ1(Cu9Al4)phases,the conclusion was drawn that theε2(Cu3Al2+x)formed firstly at the Cu/Al interface.In addition,the interfacial formation mechanism of copper cladding aluminum composites was revealed completely.
作者
初娣
张建宇
姚金金
韩艳秋
吴春京
Di CHU;Jian-yu ZHANG;Jin-jin YAO;Yan-qiu HAN;Chun-jing WU(School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan 056038, China)
基金
Project(51274038)supported by the National Natural Science Foundation of China
关键词
铜包铝复合材料
垂直充芯连铸
界面形成机理
copper cladding aluminum composite
vertical core-filling continuous casting
interfacial formation mechanism
