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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 clad aluminum composites with a diameter of 12 mm and a copper layer thickness of 2 mm were fabricated by vertical core-continuous casting. The types and morphologies of interfacial intermetallics were investigated by SEM, XRD and TEM. The results show that the Cu_ / Al interface mainly consists of the layered γ_1 (Cu_9Al_4) phase, the θ (Cu_Al_2) phase and the α (Al) + θ (Cu_Al_2) eutectic, especially the residual acicular Cu_3Al_ (2 + x) phase. By comparing the nucleation driving forces of γ_1 (Cu_9Al_4) and ε_2 (Cu_3Al_ (2 + x)), it is proved that ε_2 (Cu_3Al_ (2 + x)) phase preferentially forms at the interface. In addition, the complete formation of the interface of copper clad aluminum composites was revealed.