科研之友
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摘要
In this work, the magnetic pulse welding was used to realize the joining between aluminum/magnesium dissimilar alloys sheets. The microstructure and mechanical properties of the joints obtained under different discharge energies were explored by optical microscope, scanning electron microscope, X-ray diffraction (XRD) and tensile test analysis methods. The results showed that the joint interface presents a waveform structure and straight structure. With the increase of discharge energy, the effective binding zone width of the interface increases gradually, reaching a maximum of 2. 87 mm and the undulations at the waveform interface and the mechanical properties of the joints increased accordingly. The highest tensile shear load of the joints reached 4 679. 5 N occur in discharge energy of 30 kJ, whose wave had wavelengths of 62. 7 μm and amplitudes of 9. 1 μm. The fracture morphology of the joints was analyzed and the results show that the weld joint was divided into two ellipse rings. Particles and a few voids were found in the inner ring, and the outer ring had streak structure. The high tensile shear load of the Al/Mg dissimilar joints was attributed to the formation of waveform structure interface which possess both mechanical interlocking and metallurgical bonding.
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