In-situ observation of tensile crack evolution of magnetic pulse welded joint

Interface microstructures of Al/Fe magnetic pulse welded (MPW) joints are known to significantly influence the mechanical properties. However, their impact on joint failure remains unclear. In-situ tensile tests were conducted at room temperature and 300 °C in this study. At room temperature, cracks are deflected by intermetallic compounds (IMCs) towards the Al sheet. However, crack growth can be terminated by hard-oriented grains and grain boundaries (GBs). In contrast, at 300 °C, the sliding of GBs and the weakening of the crack hindering effect of IMCs lead to failure of the Al sheet near the interface. These findings provide insights into the failure mechanisms of MPW joints.