crack elimination by al concentration in gtaw- claded alxcocrfeni high entropy alloy

In this study, two high entropy alloys of alcocrfeni (al1) and al0.7cocrfeni (al0.7), were cladded on plain carbon steel using the gas-tungsten arc welding process at a welding current of 180 a and a welding speed of 1.4 mm/s. clads microstructures and types of cracks have been investigated by a combination of optical microscopy (om), field emission scanning electron microscopy (fesem), x-ray diffractometry (xrd) analysis, and microhardness measurements. results indicate that the al1 clads has a petal-like structure of the bcc phase and the cr-rich phase at grain boundaries. both intergranular and transgranular cracks were identified in the al1 alloy. the type of crack was assumed to be a solidification cracking. by reducing al in the al0.7 alloy, the cr-rich phase eliminated, and a new phase with the fcc crystal lattice formed in various morphologies. a combination of factors, including a decrease in the solidification range, formation of the fcc phase, and reduction in hardness, was attributed to crack elimination in the al0.7 alloy.