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Application of the cluster variation method to ordering in an interstitial solid solution: the γ-Fe[N]/γ′-Fe4N1−x equilibrium

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Abstract

The tetrahedron approximation of the cluster variation method (CVM) was applied to describe the ordering of N atoms on the fcc interstitial sublattice of γ-Fe[N] and γ′-Fe4N1−x . A Lennard-Jones potential was used to describe the dominantly strain-induced interactions, caused by the misfitting of the N atoms in the interstitial octahedral sites. The γ-Fe[N]/γ′-Fe4N1−x miscibility gap, short-range ordering (SRO), and long-range ordering (LRO) of nitrogen in γ-Fe[N] and γ′-Fe4N1−x , respectively, and lattice parameters of γ and γ′ were calculated. For the first time, N distribution parameters, as calculated by CVM, were compared directly to Mossbauer data for specific surroundings of Fe atoms.

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Pekelharing, M.I., Bottger, A.J., Somers, M.A.J. et al. Application of the cluster variation method to ordering in an interstitial solid solution: the γ-Fe[N]/γ′-Fe4N1−x equilibrium. Metall Mater Trans A 30, 1945–1953 (1999). https://doi.org/10.1007/s11661-999-0005-0

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