A high-strength, low-density Fe-Ni-based high-entropy
superalloy with spherical γ′ coherent reinforcement and its preparation method are disclosed. Belonging to the field of high-entropy superalloys, the
alloy comprises Fe, Ni, Co, Al, Ti, Nb, Cr, Mo, C, B, and Zr elements. The
mass percentages of the
alloy composition are as follows: Ni: 29.8–33.2, Co: 13.3–16.7, Al: 2.7–3.1, Ti: 2.1–3.3, Nb: 1.0–2.1, Cr: 12.0–13.9, Mo: 1.4–1.7, C: 0.01–0.03, B: 0.005–0.015, Zr: 0.02–0.03, Fe: balance. The atomic percentage of Al / (Ti+Nb) is 1–2, and the
atomic ratio of Cr / Mo is 15:1. This invention achieves coherent
precipitation of spherical γ′ nanoparticles on a γ matrix through
alloy composition design. The γ′ nanoparticles remain stable at 750℃ for extended periods, resulting in an alloy with excellent mechanical properties and
processing deformability. Its
room temperature yield strength exceeds 820 MPa,
room temperature elongation exceeds 20%, and its yield strength at 700℃ exceeds 710 MPa. Furthermore, the high
Fe content effectively reduces the alloy's cost, the preparation process is simple, and the density is below 7.80 g / cm³. 3 It is a high-strength, low-density Fe-Ni based high-entropy
superalloy.