Print Email Facebook Twitter Effect of mixed partial occupation of metal sites on the phase stability of γ-Cr23- x Fe x C6 (x = 0-3) carbides Title Effect of mixed partial occupation of metal sites on the phase stability of γ-Cr23- x Fe x C6 (x = 0-3) carbides Author Souissi, Maaouia (National Institute for Materials Science) Sluiter, M.H.F. (TU Delft (OLD) MSE-7) Matsunaga, Tetsuya (National Institute for Materials Science; Ohio State University) Tabuchi, Masaaki (National Institute for Materials Science) Mills, Michael J. (Ohio State University) Sahara, Ryoji (National Institute for Materials Science) Date 2018 Abstract The effect of mixed partial occupation of metal sites on the phase stability of the γ-Cr23-x Fe x C6 (x = 0-3) carbides is explored as function of composition and temperature. Ab initio calculations combined with statistical thermodynamics approaches reveal that the site occupation of the carbides may be incorrectly predicted when only the commonly used approach of full sublattice occupation is considered. We found that the γ-M23C6 structure can be understood as a familiar sodium chloride structure with positively charged rhombic dodecahedron (M(4a) M12 (48h)) and negatively charged cubo-octahedron (M8 (32f) C6 (24e)) super-ion clusters, together with interstitial metal atoms at the 8c sites. The stability of the partially occupied phase can be easily rationalized on the basis of a super-ion analysis of the carbide phase. This new understanding of γ-M23C6 carbides may facilitate further development of high-chromium heat-resistant steels. To reference this document use: http://resolver.tudelft.nl/uuid:462f18a5-25ef-44ca-85bc-43d53e5ead9b DOI https://doi.org/10.1038/s41598-018-25642-y ISSN 2045-2322 Source Scientific Reports, 8 (1) Part of collection Institutional Repository Document type journal article Rights © 2018 Maaouia Souissi, M.H.F. Sluiter, Tetsuya Matsunaga, Masaaki Tabuchi, Michael J. Mills, Ryoji Sahara Files PDF s41598_018_25642_y.pdf 2.44 MB Close viewer /islandora/object/uuid:462f18a5-25ef-44ca-85bc-43d53e5ead9b/datastream/OBJ/view