Thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-Ti-Nb-type nanoparticle-strengthened high-entropy alloys

The precipitate morphologies, coarsening kinetics, elemental partitioning behaviors, grain structures, and tensile properties were explored in detail for L12-strengthened Ni39.9Co20Fe15Cr15Al6Ti4-xNbxB0.1 ( x = 0 at.%, 2 at.%, and 4 at.%) high-entropy alloys (HEAs). By substituting Ti with Nb, the spheroidal-to-cuboidal precipitate morphological transition, increase in the coarsening kinetics, and phase decomposition upon aging at 800 & DEG;C occurred. The excessive addition of Nb brings about the grain boundary precipitation of an Nb-rich phase along with the phase decomposition from the L1 2 to lamellar-structured D0 19 phase upon the long-term aging duration. By partially substituting Ti with Nb, the chemically complex and thermally stable L1 2 phase with a composition of (Ni58.8Co9.8Fe2.7)(Al12.7Ti5.8Nb7.5Cr2.3) ensures the stable phase structure and clean grain boundaries, which guarantees the superb high-temperature mechanical properties (791 & PLUSMN; 7 MPa for yielding and 1013 & PLUSMN; 11 MPa for failure) at 700 & DEG;C. Stacking faults (SFs) were observed to prevail during the plastic deformation, offering a high work-hardening capability at 700 & DEG;C. An anomalous rise in the yield strength at 800 & DEG;C was found, which could be ascribed to the multi-layered super-partial dislocations with a cross-slip configuration within the L1 2 particles.& COPY; 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.