摘要
研究了Ag元素对Zn-Al钎料显微组织的影响,添加Ag元素能够细化Zn-Al钎料显微组织.结合钎焊接头力学性能、钎焊接头显微组织以及断口形貌,分析了Zn-AlAg钎料铜-铝钎焊接头的断裂机理.在外力作用下,钎缝显微组织中脆硬的块状CuAl2相与其周围组织难以实现同步协调变形,在CuAl2相边缘容易产生应力集中,从而萌生裂纹源,这是Zn-Al-Ag钎料铜-铝钎焊接头发生断裂的主要原因.添加Ag元素后,钎缝中块状CuAl2相尺寸变小,应力集中倾向降低,对应的钎焊接头强度提高.当Ag元素添加量为3.3%(质量分数)时,钎焊接头强度达到最高,其对应的断口形貌中韧窝状形貌大而深.
The effects of Ag on the microstructure of ZnAl filler metals were studied,and it was found that Ag addition could refine the microstructure of Zn-Al filler metals. The fracture mechanism of brazed joint was analyzed based on the microstructure,mechanical properties and fractograph. The results show that brittle blocky CuAl2phases could not synchronously and coordinately deform with the surrounding phases under external forces. The stress concentration occurred easily on the boundary of CuAl2phases and resulted in cracking which led to joint fracture. By adding Ag,the CuAl2phase became finer and the joint strength increased. When Ag content was 3. 3wt. % in the filler metal,the joint strength reached the highest. Meanwhile,the dimples were large and deep in the fractured surface.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第9期55-58,116,共4页
Transactions of The China Welding Institution
基金
江苏省淮阴工学院青年科研基金资助项目(HGC1017)
