合金元素对Sn-57Bi无铅钎料组织及韧性的影响

Effect of Alloy Element on Microstructure and Impact Toughness of Sn-57Bi Lead-free Solders

研究了添加不同含量的合金元素Ag,Ge,Cu,Sb,Zn,Ce,P,Ni对Sn-57Bi钎料的熔化温度、润湿性能、冲击韧性和显微组织的影响。研究结果表明,合金元素的添加对于钎料的熔化特性的影响不大,P,Ni的加入会导致出现硬脆的Bi,削弱了钎料的性能,Ag3Sn和富锌相则在形状合适时可以强化钎料的性能。单独加入合金元素Ag,Ge,Zn,Cu可以改善钎料的塑韧性,Ag,Ge还可以提高钎料的屈服强度和接头的剪切强度。合金元素Sb,Ce,P,Ni的加入会弱化钎料的塑韧性。而在同时添加多种合金元素的钎料合金中,43Sn-Bi-1Ge-1Ag的改善效果最好。

The effect of Ag,Ge,Cu,Sb,Zn,Ce,P and Ni inclusions on melting temperature,wettability,impact toughness and microstructure of 43Sn-57Bi lead-free solders were investigated.The result showed that those inclusions had little influence on melting temperature of the solders.Addition of P,Ni resulted in the appearance of Bi,which decreased the performance of solders.Ag3Sn and zinc rich phase could increase the performance when the shape was appropriate.Add Ag,Ge,Zn,Cu solely could improve the solder＇s ductility,while Sb,Ce,P,Ni could decrease the ductility.Yield strength of the solders and shear strength of the joint could improve with the addition of Ag,Ge.The improvement effort of 43Sn-Bi-1Ge-1Ag was the best in the solders with several inclusions.