Effect of Ti₃AlC₂ on Microstructure and Properties of Fe₅₀Mn₃₀Co₁₀Cr₁₀ High-entropy Alloy Deposited by Laser Directed Energy Deposition

The effects of Ti₃AlC₂ particles on the microstructure and properties of Fe₅₀Mn₃₀Co₁₀Cr₁₀ high-entropy alloy matrix composites prepared by laser directed energy deposition were studied by analyzing the phase composition, mechanical properties and tribological properties. The results show that the addition of Ti₃AlC₂ particles can improve the stability of FCC γ phase, inhibit the formation of HCP ε phase, and reduce the average grain size by 74%. The microstructure of the composite is changed from FCC γ and HCP ε dual-phase to FCC γ single-phase. Meanwhile, a new carbide phase TiC is generated, which results in lattice distortion. Compared with Fe₅₀Mn₃₀Co₁₀Cr₁₀, the tensile strength and compressive strength of the composite are increased by 25% and 21%, respectively, and the friction coefficient and wear rate are decreased by 26% and 37%, respectively. Ti₃AlC₂ can effectively stabilize the microstructure of Fe₅₀Mn₃₀Co₁₀Cr₁₀, significantly improve the strength and wear resistance of the high entropy alloy, and provide a new method for strengthening the high entropy alloy