Abstract
The AlCoCrFeNi2.1 eutectic high-entropy alloy(EHEA)was prepared by selective laser melting(SLM),fo-cusing on the anisotropy of microstructure and mechanical performance.The AlCoCrFeNi2.1 EHEA printed by SLM has face-centered cubic(FCC)and body-centered cubic(BCC)/B2 phases,and the FCC phase accu-mulates at the boundary of the molten pool.With the increase in volumetric energy density(VED),the content of the FCC phase parallel to the surface in the direction of the building increases from 30.9％to 41％.The X-Z plane mainly produces columnar crystals along the temperature gradient,while a large number of equiaxed crystals are produced in the X-Y direction.When the volume energy density is 157 kJ/mol(VED 157),the average grain size is 1.33 μm for BCC and 1.14 μm for FCC,which is signif-icantly smaller than other preparation methods.Due to defect distribution and size,the microhardness of the X-Y plane is generally higher than that of the X-Z plane,with maximum hardnesses of 660 HV and 655 HV,respectively,which is much higher than those of traditionally manufactured counterparts.The compression performance of SLM process AlCoCrFeNi2.1 EHEAs shows maximum yield strength of 1567 MPa,and the ultimate compressive strength can reach 3276 MPa.
NETL
NSTL
维普
万方数据