摘要
采用Zn-14Al过共晶焊料并借助超声波振动对Al/Cu异质金属进行了无钎剂钎焊连接,研究了在420℃超声钎焊不同时间时接头显微结构及力学性能的影响。研究结果表明,随着超声振动时间的延长,钎缝层中的α-Al相减小,Zn-Al共晶相和CuZn5相增多,Cu界面反应层由以CuZn5相为主逐步转变为Al4.2Cu3.2Zn0.7相。接头的剪切强度随钎焊时间的延长呈现先增加后减小趋势,钎焊时间为8s时接头获得了最佳的剪切强度82.6MPa。
Al/Cu dissimilar metals were jointed using an ultrasound-assisted fluxless brazing method with Zn-14 Al hypereutectic filler metal. The effect of ultrasonic brazing time at 420 ℃ on the microstructure and mechanical properties of the joint was investigated. The results show that with the increase of ultrasonic vibration time, the α-Al phase in the brazed seam layer decrease, and the Zn-Al eutectic phase and CuZn5 phase increase. CuZn5 phase changes into Al4.2Cu3.2Zn0.7 phase in the Cu interfacial layer. The shear strength of the joint increases firstly then decreases with prolonging ultrasonic brazing time,the highest shear strength is obtained with a value of 82.6 MPa when the joint is ultrasonic brazed for 8 s.
作者
田仕
毛永灵
彭超
TIAN Shi;MAO Yongling;PENG Chao(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《热加工工艺》
北大核心
2019年第13期30-33,共4页
Hot Working Technology
