Abstract
The present work developed a novel low-density (7.71 g/cm3) and high-strength Fe-Ni-base high-entropy superalloy with a composition of Fe-33.2Ni-13.4Co-13.8Cr -3.1Al-2.2Ti-1.1Nb-1.7Mo-0.03C-0.015B-0.03Zr (wt. %), which contains spherical γ' nanoparticles coherently-precipitated into FCC-γ matrix. These γ' nanoprecipitates were coarsened slowly at 1023 K with the particle size being ∼40 nm after 1000 h-aging, showing a great microstructural stability due to lower lattice misfit between γ/γ'. Thus, this superalloy exhibits excellent mechanical properties at room and high temperatures, as evidenced by the yield strength being 743 MPa at 1023 K. The involved strengthening mechanisms were further discussed. Moreover, it has a superior creep-resistant property with the rupture lifetime of 61.5 h under 450 MPa/973 K. Also, it possesses a prominent strain-hardening capacity due to the presence of abundant stacking faults in γ' nanoprecipitates. The current work opens a new way to design low-density superalloys with stable coherent microstructure at high temperatures.
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