TY - GEN A1 - Liang, Zhida A1 - Neumeier, Steffen A1 - Rao, Ziyuan A1 - Göken, Mathias A1 - Pyczak, Florian T1 - CALPHAD informed design of multicomponent CoNiCr-based superalloys exhibiting large lattice misfit and high yield stress T2 - Materials Science and Engineering: A, Structural materials N2 - Usually, Co-based superalloys contain a high fraction of W and/or Mo. The refractory elements stabilize the precipitate phase, but cause a high density. In this work, new L12-phase hardened, low-density CoNiCr-based superalloys were developed with the assistance of CALPHAD calculations. Several alloys were studied experimentally and their microstructures, elemental distributions, lattice parameters and the lattice misfit between the γ and γ′ phases were evaluated using scanning electron microscopy, transmission electron microscopy, atom probe tomography and high energy X-ray diffraction. The alloys exhibit a very high misfit, good phase stability and excellent mechanical strength. It was found by hardness tests that a two-step heat treatment improves the strength of the new alloys even further. In comparison with conventional Co-based superalloys, Co–Al–W based superalloys and Co–Ti based superalloys, as well as Ni-based superalloys, i.e. Udimet 720Li, they have a low mass density and high yield stress. They also overcome the problem of a generally low lattice misfit of previous L12-phase hardened CoNiCr-based superalloys with high Ni and Cr contents. As a result, they show cuboidal-shaped precipitates similar to Co–Al–W and Co–Al–Mo based superalloys. Y1 - 2022 U6 - https://doi.org/10.1016/j.msea.2022.143798 SN - 1873-4936 SN - 0921-5093 VL - 854 ER - TY - GEN A1 - Pyczak, Florian A1 - Liang, Zhida A1 - Neumeier, Steffen A1 - Rao, Ziyuan T1 - Stability and Physical Properties of the L12-γ′ Phase in the CoNiAlTi-System T2 - Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Y1 - 2023 U6 - https://doi.org/10.1007/s11661-022-06949-y SN - 1073-5623 VL - 54 IS - 5 SP - 1661 EP - 1670 ER -