Joining AlCoCrFeNi High Entropy Alloys and Al-6061 by explosive welding method

Abstract High entropy alloy (HEA) is an emerging class of materials that shows promising potential for many applications. Numerous HEAs have been synthesized and characterized over the past twenty years, however only limited researches have been done on the welding process of HEAs. In this research, AlCoCrFeNi High Entropy Alloys and Al-6061 plates are welded by using the explosive welding technique. In order to characterize the morphology and the composition of the compound, a scanning electron microscope was utilized. The weldability window was calculated in order to verify the weldabilty of the AlCoCrFeNi to Al-6061, and three different conditions were selected to perform the experiments. In all the experiments the AlCoCrFeNi and Al-6061 were properly welded together. However, some cracks were observed in the welded samples obtained in high velocity collision. The results suggest that the explosive welding technique is potentially a good method for joining high entropy alloys to other metals.