Darja Gačnik (Author), Andreja Jelen (Author), Mitja Krnel (Author), Stanislav Vrtnik (Author), Jože Luzar (Author), Primož Koželj (Author), Janez Dolinšek (Author), Marion Van Midden (Author), Erik Zupanič (Author), Magdalena Wencka (Author), Anton Meden (Author), Qiang Hu (Author), Sheng Guo (Author)

Abstract

In an attempt to incorporate tin (Sn) into high-entropy alloys composed of refractory metals Hf, Nb, Ti and Zr with the addition of 3d transition metals Cu, Fe, and Ni, we synthesized a series of alloys in the system HfTiZrSnM (M = Cu, Fe, Nb, Ni). The alloys were characterized crystallographically, microstructurally, and compositionally, and their physical properties were determined, with the emphasis on superconductivity. All Sn-containing alloys are multi-phase mixtures of intermetallic compounds (in most cases four). A common feature of the alloys is a microstructure of large crystalline grains of a hexagonal (Hf, Ti, Zr)$_5$Sn$_3$ partially ordered phase embedded in a matrix that also contains many small inclusions. In the HfTiZrSnCu alloy, some Cu is also incorporated into the grains. Based on the electrical resistivity, specific heat, and magnetization measurements, a superconducting (SC) state was observed in the HfTiZr, HfTiZrSn, HfTiZrSnNi, and HfTiZrSnNb alloys. The HfTiZrSnFe alloy shows a partial SC transition, whereas the HfTiZrSnCu alloy is non-superconducting. All SC alloys are type II superconductors and belong to the Anderson class of “dirty” superconductors.

Keywords

high-entropy alloys;structure and microstructure;superconductivity;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FMF - Faculty of Mathematics and Physics
UDC: 53
COBISS: 71210755 Link will open in a new window
ISSN: 1996-1944
Views: 115
Downloads: 46
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Other data

Type (COBISS): Article
Pages: str. 3953-1-3953-26
Volume: ǂVol. ǂ14
Issue: ǂno. ǂ14
Chronology: 2021
DOI: 10.3390/ma14143953
ID: 14956887