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Effect of Co and Cr on the Stability of Strengthening Phases in Nickelbase Superalloys
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Version 1
: Received: 6 July 2022 / Approved: 8 July 2022 / Online: 8 July 2022 (03:12:45 CEST)
A peer-reviewed article of this Preprint also exists.
Bäker, M.; Rösler, J. Effect of Co and Cr on the Stability of Strengthening Phases in Nickelbase Superalloys. Crystals 2022, 12, 1084. Bäker, M.; Rösler, J. Effect of Co and Cr on the Stability of Strengthening Phases in Nickelbase Superalloys. Crystals 2022, 12, 1084.
Abstract
Nickel-base superalloys like VDM 780 may possess a high content of Cr and Co. This influences solution energies of phase-forming elements like Al and Ta (γ′-phase), Nb (γ′′- and δ-phase), and Ti (η-phase). We perform density functional theory studies of a nickel matrix at 0 K with high concentrations of either Co and Cr and calculate the influence of these elements on solution energies. In the case of Co, the solution energy can be predicted well by the nearest-neighbor interaction in the Co-rich matrix. For Cr, the effect is more complicated because Cr has a larger ionic radius and changes the magnetic state of the material. The effect of a Cr-rich matrix on the energy of Co is dominated by magnetic effects, interactions with the other elements by elastic deformation of the lattice.
Keywords
nickelbase alloys; phase stability; density functional theory
Subject
Chemistry and Materials Science, Metals, Alloys and Metallurgy
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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