High-yield-strength Fe-Mn-Co-Cr-Ti metastable high-entropy alloy and preparation method thereof

The invention discloses a high-yield-strength Fe-Mn-Co-Cr-Ti system metastable high-entropy alloy and a preparation method of the high-yield-strength Fe-Mn-Co-Cr-Ti system metastable high-entropy alloy, and belongs to the field of high-entropy alloys. The high-entropy alloy contains Fe, Mn, Co, Cr, Ti and N elements, the proportion composition of the metal elements is FeaMnbCocCrcTid, the atomic percentage a is 39.5-45, the atomic percentage b is 30-40, the atomic percentage c is 8-10, the atomic percentage d is 0.1-0.5, and the sum of a, b, 2c and d is 100; the high-entropy alloy contains an FCC matrix phase and a TiN reinforcement phase and is prepared through a direct energy deposition technology. A matrix phase of a printing forming sample is an FCC phase, a reinforced phase TiN formed in the gas atomization process is dispersed and distributed in the matrix, and after optimization, the tensile yield strength of an obtained workpiece is 505-515 MPa, the ultimate tensile strength is 725-755 MPa, and the pe