Abstract
1060 Al and Al0.1CoCrFeNi are friction stir lap welded in this study. The limited flow of high-entropy alloy avoids the occurrences of hook and cold lap defects in the lap joint. Coarsening of large-size Al(Cr)-rich particles and dissolution of small-size Al(Cr)-rich particles simultaneously take place in the heat-affected zone of high-entropy alloy during the welding. The plastic deformation of high-entropy alloy induced by welding tool refines and homogenizes the microstructures in thermo-mechanically affected zone and stir zone. Friction stir lap weld of high-entropy alloy presents higher hardness than the base metal in each zone. The hardness of stir zone exhibits a maximum of 600 Hv, higher than the maximum hardness of AlxCoCrFeNi traditionally obtained. This should be attributed to the microstructure refinement as well as the enhancement of solid-solution strengthening and the occurrence of body-centered-cubic structures due to Al content improvement.
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