Naslov
Transition from high-entropy to conventional metallic glasses in(TiZrNbCu)1-xNix system

Autori
Babić, Emil ; Ristić, Ramir ; Figueroa, I. A. ; Kuršumović, Ahmed ; Pajić, Damir

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

Izvornik
International conference on functional materials 2017 / Abdelwaheb Cheikhrouhou - Tunis : Faculte des Sciences-Tunisie de Sfax, 2017, P1-02

Skup
International conference on functional materials 2017

Mjesto i datum
Hammamet, Tunis, 06.09.2017. - 08.09.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
High entropy alloys, metallic glasses, magnetic susceptibility

Sažetak
A comprehensive study of the electronic structure and properties of (TiZrNbCu)1-xNix (x≤0.25) amorphous high-entropy alloys (a-HEA [1]) has been extended to x=0.5 in order to compare the behaviours of a-HEA and a conventional Ni-base metallic glasses (MG). All samples were ribbons about 20 μm thick and their fully amorphous state was verified by thermal analysis and X-ray diffraction (XRD). XRD patterns were also used in order to deduce the nearest neighbour distances and probable local atomic arrangements (SRO)[1, 2]. Precise composition and the distribution of components were studied with a scanning electron microscope (SEM) with an energy dispersive spectroscopy (EDS) attachment. Here we discuss thermal parameters (the crystallization enthalpies ΔHx, the glass transition temperature Tg, the first crystallisation temperature Tx and the melting and liquidus temperatures Tm and Tl respectively), the magnetic susceptibility χexp and the Young's modulus E. The analysis of XRD patterns indicates a change in SRO from body centered cubic (bcc)-like towards face centered cubic (fcc)-like for x>0.25 (which is consistent with the valence electron number criterion, VEC<7 for the stability of bcc structure in crystalline HEA [1]). This unexpected change of SRO with composition within the glassy state strongly affects the variations of all properties with x in studied alloys. Thus, by changing composition one can adjust the properties which may be useful for applications of such alloy. The glass forming ability and the applicability of the rule-of-mixtures to studied alloys are briefly discussed. 1. K. Biljaković et al, J. Alloys Compd. 695, 2661 (2017). 2. R. Ristić et al, J. Alloys Compd. 621, 136 (2015).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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