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采用不同的焊接工艺参数对1060铝合金与AZ31镁合金进行磁脉冲焊接试验。结合铝-铝界面形貌,对比探讨磁脉冲铝-镁异种金属焊接接头界面波特征。通过SEM/EDS、纳米压痕试验,着重研究界面“熔化区”的产生机理、分布特点以及此区域的硬度变化。试验结果表明:界面呈不规则的波状结合方式,嵌入镁层的界面波远大于铝层;在“熔化区”会生成脆硬的第二相,此相分布在Al基一侧。通过调整适当的焊接工艺参数可避免此“熔化区”产生。
Different welding process parameters were used to test the magnetic pulse welding of 1060 aluminum alloy and AZ31 magnesium alloy. Combining with the morphology of aluminum - aluminum interface, the characteristics of interface wave of magnetic pulse aluminum - magnesium dissimilar metal welded joint were discussed. Through the SEM / EDS and nanoindentation experiments, the mechanism of the interface “melting zone ”, the distribution characteristics and the change of the hardness in this zone are mainly studied. The experimental results show that the interface is irregularly wave-shaped, and the interfacial waves embedded in the Mg layer are much larger than that of the Al layer. In the “melting zone”, a brittle second phase is formed, which is distributed on the Al-based side. This “melt zone” can be avoided by adjusting the appropriate welding process parameters.