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采用PLC控制固定间隙超声波辅助Cu/Al异质金属的钎焊工艺,在钎焊温度为380、420和460℃下制备Al/Zn-3Al/Cu钎焊接头,观察了不同温度超声钎焊时接头的显微组织与力学性能变化。结果表明,当钎焊温度为380℃时,钎缝层由Zn-Al共晶、α-Al树枝状晶和CuZn_5相组成;当钎焊温度为420和460℃时,钎缝层由α-Al树枝状晶、CuZn_5相和Al_(4.2)Cu_(3.2)Zn_(0.7)相组成;在钎焊温度为420℃时,金属间化合物层厚度为1.9μm,扩散层厚度1.3μm,整个界面层厚度为三种钎焊温度下的最低值,此时取得钎焊接头抗拉强度最大值。
The Al / Zn-3Al / Cu brazed joints were prepared by PLC control of fixed gap ultrasonic assisted Cu / Al heterogeneous brazing process at the brazing temperatures of 380, 420 and 460 ℃. The effects of different temperature ultrasonic brazing Joints microstructure and mechanical properties changes. The results show that when the brazing temperature is 380 ℃, the brazing layer consists of Zn-Al eutectic, α-Al dendrite and CuZn_5 phase. When the brazing temperature is 420 and 460 ℃, Al dendrite, CuZn_5 phase and Al 4.2 Cu 3.2 Zn 0.7 phase. When the brazing temperature is 420 ℃, the thickness of the intermetallic compound layer is 1.9μm and the thickness of the diffusion layer is 1.3μm. The entire interface layer The thickness is the lowest of the three brazing temperatures, at which point the maximum tensile strength of the brazed joint is achieved.