【摘要】 在Sn-3.8Ag-0.7Cu无铅钎料中添加质量分数为1%的稀土Er会在其内部形成尺寸较大的稀土相ErSn₃.暴露于空气中ErSn₃将发生氧化,同时在其表面会出现Sn晶须的快速生长现象.室温时效条件下,在氧化的ErSn₃表面会生长出少量的杆状Sn晶须,Sn晶须的截面尺寸会发生连续变化;高温时效条件下,在氧化的ErSn₃表面会生长出大量的针状Sn晶须,Sn晶须的截面尺寸会发生阶梯式变化.提出了ErSn₃氧化过程中体积应变能是一个变量的模型,可以解释观察到的现象.更多还原

【Abstract】 Large sized ErSn₃ particles precipitated in the Sn-3.8Ag-0.7Cu-1.0Er solder alloy are oxidized when exposed in air,and it was found that Sn whiskers can rapidly grow on the oxidized ErSn₃.During aging at room temperature,a few rod-like Sn whiskers were observed and their diameter could be gradually changed.During aging at 150℃,a great number of needle-like Sn whiskers were observed and their diameter could be also changed step by step.A model,in which the volume strain energy is not a constant during oxidation of ErSn₃,was suggested to explain the observed results.更多还原