Experimental investigation of the local environment and lattice distortion in refractory medium entropy alloys

• Published in: Scripta materialia Vol. 211; p. 114532
• Main Authors: Lilensten, Lola, Provost, Karine, Perrière, Loïc, Fonda, Emiliano, Couzinié, Jean-Philippe, Amann, Fabienne, Radtke, Martin, Dirras, Guy, Guillot, Ivan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-04-2022; Elsevier
• Subjects: Chemical Sciences; Condensed Matter; Extended X-ray absorption fine structure (EXAFS); Lattice distortion; Local environment; Material chemistry; Multicomponent alloys; Physics; Refractory; Extended X-ray absorption fine structure (EXAFS); Refractory; Multicomponent alloys; Local environment; Lattice distortion
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2022.114532

EXAFS analysis of pure elements, binary and ternary equiatomic refractory alloys within the Nb-Zr-Ti-Hf-Ta system is performed at the Nb and Zr K-edges to analyze the evolution of the chemical local environment and the lattice distortion. A good mixing of the elements is found at the atomic scale. For some compounds, a distribution of distances between the central atom and its neighbors suggests a distortion of the structure. Finally, analysis of the Debye-Waller parameters shows some correlation with the lattice distortion parameter δ², and allows to quantify experimentally the static disorder in medium entropy alloys.
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