Naslov
Electronic structure and properties of (TiZrNbCu)1- xNix high entropy amorphous alloys

Autori
Biljaković, Katica ; Remenyi, György ; Figueroa, Ignacio ; Ristić, Ramir ; Pajić, Damir ; Kuršumović, Ahmed ; Starešinić, Damir ; Zadro, Krešo ; Babić, Emil

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
16th International Conference on Liquid and Amorphous Metals / Dirk Holland-Moritz, Florian Kargl - Köln : Institute of Materials Physics in Space German Aerospace Center (DLR), 2016, 94-94

Skup
16th International Conference on Liquid and Amorphous Metals

Mjesto i datum
Bonn, Njemačka, 04.09.2016. - 09.09.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Metallic glasses; Heat measurements; Mechanical properties

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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