Soldering 6061 Al by Sn9Zn Coating With/Without Two Step Ultrasonic Effect

다국어 초록 (Multilingual Abstract)

The work described the effect of soldering 6061 Al by soldering coating with/without two step ultrasonic process, basedon Sn9Zn alloy prepared by high frequency melting and rapid solidification. The microstructure, interfacial morphology,shear strength and mechanical morphology of 6061 aluminum alloy soldered joints were compared and analyzed. Theresults showed that the ultrasonic soldering with coating by two step ultrasonic process technology could greatly improvethe morphology of the joints and refine the grain size. The solder layer with larger scallop shape was transformed into adense fine structure. After two step ultrasonic effect, the width of the joint was about 28% higher than that under the firstultrasonic process. The Zn-rich phase length decreased from an average of 90 μm to an average of 25 μm, about 27% of theoriginal length. The refinement of solder seam was related to the additional dissolved Al and IMC particles. The refinementmechanism was mainly sono-crystallization + sono-fragmentation with two step ultrasonic effect, which was different fromthe refinement mechanisms of the first ultrasonic effect with sono-crystallization. At the same time, the shear strength of6061 aluminum alloy joints bonded at low temperature could reach 230 MPa by two step ultrasonic effect. Compared withthe ultrasonic soldering with coating, the hardness and maximum strength were improved by 14.5% and 28%, respectively.

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