Microstructure and properties of AlCoCrFeNi2.1 eutectic high entropy alloy manufactured by selective laser melting

In this paper, SLM technique with different laser volume energy density (VED) was used to prepare AlCoCrFeNi2.1 eutectic high entropy alloy, in order to investigate the effect of different VED on the relative density, microstructure, mechanical properties and high temperature oxidation properties of the high entropy alloy. As a result, when the VED was raised to 187.5 J/mm3, the relative density of the alloy reaches 99.51 %, the alloy exhibits a dual-phase (FCC and BCC) lamellar eutectic structure. The sample achieves high strength and ductility at the same time, the average microhardness is 479.04 HV, the yield and tensile strength reach 1151 MPa and 1364 MPa respectively, and the elongation at fracture is 16.37 %.