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采用扫描电镜、能谱仪及电子拉伸试验机系统地研究了Cu、Ag作为中间层铝基复合材料瞬间液相扩散连接接头的组织与力学性能。根据组织结构特点接头可分为增强相偏聚区、增强相贫化区和母材区。增强相偏聚区的组织主要为Al2 O3颗粒和铝合金基体 ,并含有少量的MgAl2 O4 化合物 ,对于Cu中间层接头还含有少量的Al2 Cu化合物。连接温度、连接时间和中间层厚度对接头抗剪强度具有较明显的影响。在一定条件下 ,Cu、Ag中间层接头的抗剪强度分别为 82～ 99MPa和 86～ 10 9MPa。增强相偏聚区是接头最薄弱的区域 ,减少增强相的偏聚是进一步改善接头力学性能的重要途径。
The microstructures and mechanical properties of Cu and Ag were investigated systematically with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and electron tensile testing (TES). According to the characteristics of the organizational structure joints can be divided into enhanced phase segregation zone, enhanced phase depletion zone and base metal zone. The microstructure of the enhanced phase-segregation zone is mainly composed of Al 2 O 3 particles and an aluminum alloy matrix with a small amount of MgAl 2 O 4 compounds and a small amount of Al 2 Cu compounds for Cu intermediate joints. The connection temperature, the connection time and the thickness of the middle layer have obvious influence on the shear strength of the joint. Under certain conditions, the shear strength of Cu and Ag interlayer joints are 82 ~ 99MPa and 86 ~ 109MPa, respectively. Reinforced phase-separation zone is the weakest area of the joint. Reducing the segregation of the reinforcing phase is an important way to further improve the mechanical properties of the joint.