Phase formation in CrFeCoNi nitride thin films
نویسندگان
چکیده
As a single-phase alloy, CrFeCoNi is face centered cubic (fcc) material related to the archetypical high-entropy Cantor alloy CrFeCoNiMn. For thin films, of approximately equimolar composition tends assume an fcc structure when grown at room temperature by magnetron sputtering. However, solid solution state typically not achieved for films higher temperatures. The same holds true alloy-based ceramics (nitrides and oxides), where phase formation extremely sensitive process parameters such as amount reactive gas. This study combines theoretical experimental methods understand in nitrogen-containing films. Density functional theory calculations considering three competing phases (CrN, Fe-Ni Co) show that free energy mixing, delta G (CrFeCoNi)1-xNx solutions has maximum x = 0.20-0.25, becomes lower less than 0.20, greater 0.25. Thin (x 0.14-0.41) sputtering stabilization metallic lesser or equal 0.22 NaCl B1 0.33, consistent with prediction. In contrast, intermediate amounts nitrogen 0.22) temperatures segregation into multiple CrN, Fe-Ni-rich Co. These results offer explanation requirement kinetically limited growth conditions low obtaining Cantor-like are importance understanding phase-formation mechanisms multicomponent ceramics.
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ژورنال
عنوان ژورنال: Physical Review Materials
سال: 2023
ISSN: ['2476-0455', '2475-9953']
DOI: https://doi.org/10.1103/physrevmaterials.7.055002