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Metals 2016, 6(12), 298;

Phase Evolution of the AlxNbTiVZr (x = 0; 0.5; 1; 1.5) High Entropy Alloys

Laboratory of Bulk Nanostructured Materials, Belgorod National Research University, Belgorod 308015, Russia
National Science Center, Kharkov Institute of Physics and Technology, NAS of Ukraine, Kharkov 61108, Ukraine
Author to whom correspondence should be addressed.
Academic Editor: Michael C. Gao
Received: 26 October 2016 / Revised: 19 November 2016 / Accepted: 21 November 2016 / Published: 25 November 2016
(This article belongs to the Special Issue High-Entropy Alloys (HEAs))
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AlxNbTiVZr (x = 0; 0.5; 1; 1.5) high entropy alloys were fabricated by vacuum arc melting and annealed at 1200 °C for 24 h. The NbTiVZr alloy had single body centered cubic (bcc) solid solution phase after annealing at 1200 °C, while, in the Al-containing alloys, C14 Laves and Zr2Al-type phases are found. The alloys were subjected to annealing at 800 °C and 1000 °C. It was shown that annealing temperature (800 °C or 1000 °C) weakly affected the produced phases but the Al content had pronounced effect on structure of the annealed alloys. The NbTiVZr alloy decomposed into bcc, Zr-rich hexagonal close-packed (hcp), and C15 Laves phases. In the Al0.5NbTiVZr alloy, the bcc matrix phase also decomposed into a mixture of bcc and C14 Laves phases. In the AlNbTiVZr alloy, annealing resulted in an increase of volume fraction of Zr2Al-type phase. Finally, in the Al1.5NbTiVZr alloy, formation of AlNb2-type phase was observed. The highest fraction of second phases appeared after annealing in the NbTiVZr alloy. It is demonstrated that the strong chemical affinity and high enthalpy of formation of intermetallic phases in Al-Zr atomic pair govern the intermetallic phase formation in the alloys at 1200 °C. Increase of volume fraction of second phases in the alloys due to annealing at 800 °C and 1000 °C is in proportion to the decrease of Zr concentration in the bcc matrix phase. View Full-Text
Keywords: high-entropy alloys; microstructure; phase stability; second phases high-entropy alloys; microstructure; phase stability; second phases

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Yurchenko, N.Y.; Stepanov, N.D.; Tikhonovsky, M.A.; Salishchev, G.A. Phase Evolution of the AlxNbTiVZr (x = 0; 0.5; 1; 1.5) High Entropy Alloys. Metals 2016, 6, 298.

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