A Combined Experimental and Modeling Approach to Investigate the Performance of Joint Between AZ31 Magnesium and Uncoated DP590 Steel Using Friction Stir-Assisted Scribe Technique

In this study, the friction stir-assisted scribe technique was used to achieve a viable joint between AZ31 magnesium alloy and uncoated DP590 steel. The mechanical properties and performance of the joint were investigated using finite element modeling and electron microscopy. The joint strength can be ascribed to two factors, the mechanical interlocking due to hook feature, and the metallurgical bonding of two materials at their interface. A computational model was used to quantify the contributions from both factors. The interface of the weld was modeled using a cohesive zone model. A sensitivity analysis was also performed to investigate the effect of hook geometry on joint strength. Energy disperse x-ray spectroscopy analysis was used to further investigate the metallurgical bonding, and it was found that complex aluminum oxides were formed at the interface.