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对低温下采用Zn-5Al钎料超声辅助钎焊2024铝合金进行研究。在温度为400℃时,采用功率为200W、振幅为15μm、频率为21kHz的超声对试样实施连接。采用超声波来加速Al从母材到焊缝的溶解,从而改变接头的微观组织。同时,通过增加超声时间来降低接头中共晶组织的含量。当超声振动时间从3s增加到30s时,焊缝中共晶相的含量从12.9%减少到0.9%剪切强度提高了20%,并且,当超声振动时间为30s时,接头的剪切强度达到最大为149-153MPa。为了研究接头力学性能的变化,测试了接头中各相的弹性模量和硬度,同时分析了不同超声振动时间下的接头断口形貌。
Study on the ultrasonic assisted soldering of 2024 aluminum alloy with Zn-5Al solder under low temperature. At a temperature of 400 ° C, the samples were connected using ultrasound with a power of 200 W, an amplitude of 15 μm and a frequency of 21 kHz. Ultrasound is used to accelerate the dissolution of Al from the base metal to the weld, thereby changing the microstructure of the joint. At the same time, by increasing the ultrasonic time to reduce the eutectic joints in the content. When the ultrasonic vibration time is increased from 3s to 30s, the content of eutectic phase in the weld decreases from 12.9% to 0.9% and the shear strength increases by 20%. And when the ultrasonic vibration time is 30s, the shear strength reaches the maximum For 149-153MPa. In order to study the mechanical properties of the joint, the elastic modulus and hardness of each phase in the joint were tested, and the fracture morphology of the joint under different ultrasonic vibration time was analyzed.