Ag-Cu-Sn三元合金钎料的快速凝固组织与性能

Microstructure and properties of rapidly solidified Ag-Cu-Sn ternary brazing fillers

摘要: 采用熔体急冷法制备出Ag_42.47Cu_57.53-xSn_x(x=12.23,12.94,13.65,质量分数,%)急冷钎料箔材,分析了钎料的相组成、组织形态、电阻率和力学性能.结果表明,急冷钎料由(Ag),α-Cu及少量Cu_13.7Sn相组成.随着锡含量的增加,凝固组织显著细化,晶界增多,溶质截留加剧,电阻率增大;细晶强化和固溶强化作用增强,合金的抗拉强度升高,R_m=280~360 MPa,断后伸长率则相应减小,A=2.8%~5%.急冷钎料的固、液相线温度分别为T_L=590~616℃和T_S=615~622℃,锡含量的增大使合金凝固温度区间有所增大.

Abstract: The phase constitution,morphology,electrical resistivity and mechanical properties of Ag_42.47Cu_57.53-xSn_x(x=12.23,12.94,13.65,mass fraction %) prepared by melt-spun method are investigated.The results indicate that the microstructure of the alloys consists of(Ag),α-Cu and a few of Cu_13.7Sn phases;with the rise of tin content,the electrical resistivity increases for refining of the microstructure and increasing of grain boundary amount and solute-trapping;on the other hand,fine crystal strengthening and solution hardening will result in the increment of tensile strength from 280 to 360 MPa,but the elongation reduces from 5 % to 2.8%.The ranges of solidus and liquidus temperature of those alloys are 590 to 616 ℃ and 615 to 622 ℃ respectively,and the temperature range increases with the increasing of tin content.