Abstract: 316L stainless steel was selected as the matrix material and Al_0.5CoCrFeNiTi_0.5 high-entropy alloy (HEA) powder was used as the particle reinforcement. The 316L stainless steel matrix composites with different HEA contents were prepared by selective laser melting (SLM). The microstructure, micro and nano mechanical properties and corrosion resistance of the prepared composites were studied. The results show that there is no hole, crack and other defects in the 316L stainless steel and its composites printed by SLM. The remelted zone is mainly composed of fine cellular grains, while the non-remelted zone is composed of cellular grains and equiaxed grains, which is caused by the temperature gradient of the molten pool during solidification. With the increase of HEA content in the composite, both the hardness and the elastic modulus of the composite show an increasing trend, and the strengthening mechanisms are mainly solid solution strengthening and fine grain strengthening. With the addition of HEA alloy, the self-corrosion potential of the composites moves first to negative and then to positive direction, and the self-corrosion tendency increases first and then decreases.

Key words: selective laser melting, high-entropy alloy, HEA/316L composite, mechanical properties, corrosion resistance