Anisotropy of microstructures and mechanical properties in FeCoNiCr_(0.5)high-entropy alloy prepared via selective laser melting

The anisotropy of microstructures and mechani-cal properties of FeCoNiCr_(0.5)high-entropy alloys(HEAs)prepared by selective laser melting(SLM)were investigated in this study.An anisotropic microstructure was obtained for the as-built FeCoNiCr_(0.5) HEA sample.Specifically,in the XOY plane(perpendicular to the building direction),the{110}texture is dominant,and the grain size is mostly between 40 and 60μm with equiaxial morphology.In the XOZ plane(parallel to the building direction),columnar grains have a length of 80-100μm,and there is no obvious preferred orientation in the structure.This structure leads to anisotropic tensile behavior in the sample where the yield strength,tensile strength,and elongation of FeCoNiCr_(0.5)HEA in the XOY plane are 528 MPa,546 MPa,and 49%,respectively,whereas those in the XOZ plane are 547 MPa,642 MPa,and 28%,respectively.The effect of deformation twins on the evolution of the work-hardening rate is also discussed,considering the anisotropy condition.