采用SEM、EDS和拉伸-剪切试验等方法研究了微量稀土元素钕对Sn-6.5Zn-xNd(x=0,0.1,0.5)钎料/铜焊点界面组织,重点是界面金属间化合物(IMC)特征及结合性能的影响.结果表明:在Sn-6.5Zn合金中添加微量钕具有明显的变质作用,能够促进界面形成均匀细密的Cu5Zn8 IMC层;钕添加量的增加对界面IMC尺寸与分布没有产生明显影响;钕添加量为0.1％(质量分数,下同)时能显著改善钎料/铜焊点结合性能,而当添加量为0.5％时,界面处稀土化合物的聚集会导致焊点结合性能下降.
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