Electronic structure and properties of (TiZrNbCu)_1-xNi_x high entropy amorphous alloys
| Autor: | Ahmed Kursumovic, Gyorgy Remenyi, Ignacio A. Figueroa, Katica Biljaković, Damir Pajić, Ramir Ristić, Damir Starešinić, Krešo Zadro, Emil Babić |
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| Přispěvatelé: | Dirk Holland-Moritz, Florian Kargl, Magnétisme et Supraconductivité (MagSup ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Department of Physics [Zagreb], Faculty of Science [Zagreb], University of Zagreb-University of Zagreb |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Analytical chemistry FOS: Physical sciences 02 engineering and technology Metallic glasses Electronic band structure Heat capacity Mechanical properties 01 natural sciences symbols.namesake Paramagnetism 0103 physical sciences Materials Chemistry Debye model ComputingMilieux_MISCELLANEOUS 010302 applied physics [PHYS]Physics [physics] Condensed Matter - Materials Science Amorphous metal Condensed matter physics Mechanical Engineering High entropy alloys Heat measurements Fermi level Metals and Alloys Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Magnetic susceptibility Amorphous solid Mechanics of Materials symbols 0210 nano-technology Glass transition |
| Zdroj: | Journal of Alloys and Compounds Journal of Alloys and Compounds, Elsevier, 2017, 695, pp.2661-2668. ⟨10.1016/j.jallcom.2016.11.179⟩ |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.11.179⟩ |
| Popis: | Comprehensive study of selected properties of four (TiZrNbCu)1-xNix (x ≤ 0.25) amorphous high entropy alloys (a-HEA) has been performed. These alloys, depending on the cooling rate, form either amorphous or crystalline (mostly two phase [1]) structure. This offers unique opportunity to study the impact of amorphisation on properties of HEA. The samples were ribbons about 20 µm thick and their fully amorphous state was verified by X-ray diffraction. The surface morphology, the actual composition and the distribution of components were studied with SEM equipped with EDX. The properties selected were the low temperature specific heat (LTSH), the magnetic susceptibility χexp and the Youngs modulus (E). Whereas LTSH and χexp were measured at the as-cast samples, E was measured both at as-cast and relaxed (short anneal [2] close to glass transition temperature [1]) samples. LTSH revealed that the electronic density of states at the Fermi level, N(EF), decreases with increasing x, whereas the Debye temperature (ΘD) increases with x. This is similar to what observed in binary and ternary amorphous alloys of early transition metals (TE) with late transition metals [2] and indicates that N(EF) is dominated with d-electrons of TE. Accordingly, the free- electron like paramagnetic contribution to χexp also decreases with x, whereas E increases with x indicating stronger interatomic bonding. The applicability of the rule of mixture to these and other HEA is briefly discussed. . References: [1] A. Cunliffe, J. Plummer, I. Figueroa and I. Todd, Intermetallics 23, 204 (2012). [2] R. Ristić, J. R. Cooper, K. Zadro, D. Pajić, J. Ivkov and E. Babić, J. Alloys Compd. 621, 136 (2015) and references therein. |
| Databáze: | OpenAIRE |
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