MOUSSA, Maria; GORSSE, Stéphane; HUOT, Jacques; BOBET, Jean-Louis

doi:10.3390/met13020343

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MOUSSA, Maria
Université du Québec à Trois-Rivières [UQTR]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GORSSE, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HUOT, Jacques
Université du Québec à Trois-Rivières [UQTR]

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Metals. 2023, vol. 13, n° 2, p. 343

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Résumé en anglais

In the present work, the effects of (i) Ti replacement by Hf and (ii) the synthesis method on microstructure and crystal structure evolution in the high-entropy alloy HfxTi(1−x)NbVZr are reported. The results of scanning electron microscopy and X-ray diffraction analysis of alloys prepared by both arc-melting and induction-melting are compared with theoretical thermodynamic calculations using the CALPHAD approach. The non-equilibrium thermodynamic calculations agree well with the experimental observations for the arc-melted alloys: a mixture of body-centered cubic (BCC) and cubic C15 Laves phases occurs for low-Ti-concentration alloys and a single BCC phase is obtained for high-Ti alloys. The agreement is not as good when using the induction-melting method: equilibrium solidification calculations predict that the most stable state is a phase mixture of BCC, hexagonal close-packed, and a cubic C15 Laves phase, while experimentally only one BCC and one hexagonal C14 Laves phase were found. The estimation of the exact cooling rate and the lack of a thermodynamic database can explain the difference. In addition, for both methods, the thermodynamic calculation confirms that for a high Ti concentration, the BCC phase is stable, whereas phase separation is enhanced with a higher Hf concentration.< Réduire

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refractory high entropy alloy

arc-melting

induction-melting

microstructure

CALPHAD

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Effect of the synthesis route on the microstructure of HfxTi(1−x)NbVZr refractory high-entropy alloys

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