钎料序号为4、7、9、11、13五种钎料火焰钎焊Cu/Al接头中钎料层与铝母材界面组织。 铝侧界面组织由柱状的初生相铝基固溶体和层片状的锌铝共晶组织构成。随着钎料中铝含量的增加，共晶组织减少，铝基固溶体与共晶组织之间的接触面积减少，且铝基固溶体的尺寸逐渐变大。

The interface microstructure between brazing layer and aluminum base metal in the Cu / Al joint brazed by five kinds of brazing filler metals with serial numbers of 4, 7, 9, 11 and 13. The microstructure of Al side interface is composed of columnar primary Al based solid solution and lamellar Zn Al eutectic structure. With the increase of Al content in solder, the eutectic structure decreases, the contact area between Al based solid solution and eutectic structure decreases, and the size of Al based solid solution increases gradually.