在Zn9.3Al7Cu合金钎料中添加了质量分数分别为0，0.1%，0.3%，0.5%的由镧粉和钕粉组成的混合稀土，研究了混合稀土含量对该合金钎料熔点、润湿性能、显微组织，以及对其钎焊铜/铝接头剪切强度的影响。结果表明：合金钎料的显微组织均由η（Zn）相、ε（CuZn₅）相、β（ZnAl）共析相组成，混合稀土的添加使大树枝状的ε（CuZn₅）相细化、分布变均匀；随着混合稀土含量的增加，合金钎料的熔点逐渐降低，润湿性能及其钎焊铜/铝接头的剪切强度均先增大后下降；当混合稀土质量分数为0.1%时，钎料在铜板和铝板上的铺展面积均达到最大，分别比未添加稀土的提高了20.4%和46.6%，其润湿铝板的界面变得连续，没有缺陷；合金钎料钎焊铜/铝接头的剪切强度也达到最大，为66.5 MPa，比未添加稀土的提高了32.5%。

Mixed rare earth metals, which were composed of La powder and Nd powder, was added into Zn9.3Al7Cu alloy solder with mass fractions of 0, 0.1%,0.3%,0.5%, respectively. The effects of mixed rare earth content on the melting point, wettability, microstructure, and on the shear strength of Cu/Al solder joint were studied. The results show that the microstructures of the alloy solders consisted of η(Zn) phase, ε(CuZn₅) phase, β(ZnAl) eutectoid phase. The addition of the mixed rare earth resulted in the refinement and evenly distribution of the large dendritic ε(CuZn₅) phase. With increasing content of mixed rare earth, the melting points of the alloy solders decreased while the wettability of the solder and the shear strength of the Cu/Al solder joint first increased and then decreased. When the mass fraction of the mixed rare earth was 0.1%, the spread areas of the solder on Al and Cu plates reached the maximum values, which were 20.4% and 46.6% higher than those without rare earth, respectively; the interface between the wetted Al plate by the solder became continuous without defects; the shear strength of Cu/Al joint welded with the alloy solder reached the maximum value of 66.5 MPa, which was 32.5% higher than that without rare earth.