微量稀土镧钕对Bi5Sb8Sn力学性能影响

Effect of adding micro amount rare earthelementLaNd on mechanical property of Bi5Sb8Sn solder alloy

摘要: 通过在Bi5Sb8Sn基体钎料上添加微量稀土镧钕形成Bi5Sb8SnRE新型钎料合金,研究了稀土镧钕对钎料合金力学性能的影响,同时对显微组织进行了分析.结果表明,稀土镧钕含量为0.2%时,Bi5Sb8SnRE合金抗拉强度和抗剪强度达到最大值,分别为58.30 MPa和15.50 MPa,合金抗拉强度和钎焊接头的抗剪强度较基体钎料Bi5Sb8Sn分别提高了44.2%和57.0%.显微组织分析表明,微量稀土镧钕的添加能显著细化该钎料的合金组织,改善合金的组织分布,提高钎料的力学性能;但当稀土含量超过0.2%时,稀土化合物的数量增多,钎料的力学性能下降.

Abstract: A new Bi5Sb8 SnRE quaternary alloy was formed by adding different content of rare earthLa, Nd into Bi5Sb8 Sn solder alloy to study the effect of its mechanical property and microstructure. The results shows that: The tensile strength and shear strengthreaches a maximum are 58.30 MPa and 15.50 MPa, compared with Bi5Sb8 Sn matrix, in which increased by 44.17% and 57.0% respectivelywhen RE adds up to0.2%. The Microscopic analysis shows that adding micro amount of RE could refine the microstructure. Meanwhile, more uniform microstructure, improvements of the mechanical properties were obtained with RE additon. However, the RE compounts are increased and the mechanical properties were decreased when the addition of RE more than 0.2wt.%.