Effects of the Chromium Content in (TiVNb) 100−x Cr x Body-Centered Cubic High Entropy Alloys Designed for Hydrogen Storage Applications

Renato Belli Strozi, Daniel Rodrigo Leiva, Guilherme Zepon, Walter José Botta and Jacques Huot
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Renato Belli Strozi: Institut de Recherche sur l’Hydrogène, Universitè du Québec à Trois-Rivières, 3351 des Forges, Trois-Rivières, QC G9A 5H7, Canada
Daniel Rodrigo Leiva: Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Via Washington Luiz, km 325, São Carlos 13565-905, Brazil
Guilherme Zepon: Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Via Washington Luiz, km 325, São Carlos 13565-905, Brazil
Walter José Botta: Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Via Washington Luiz, km 325, São Carlos 13565-905, Brazil
Jacques Huot: Institut de Recherche sur l’Hydrogène, Universitè du Québec à Trois-Rivières, 3351 des Forges, Trois-Rivières, QC G9A 5H7, Canada

Energies, 2021, vol. 14, issue 11, 1-11

Abstract: In this paper, we report an investigation of adding a non-hydride forming element in the multicomponent Ti-V-Nb-M system. By the Calculation of Phase Diagrams approach (CALPHAD), the thermodynamic phase stability of the TiVNbT (T = Cr, Mn, Fe, Co, and Ni) was investigated, and Cr was selected as the fourth alloying element due its high tendency to stabilize body-centered cubic solid solutions (BCC). The (TiVNb) 100−x Cr x alloys (with x = 15, 25, and 35 at.% Cr) were synthesized by arc-melting. The structural characterization reveals that the three alloys were composed of a major BCC phase, which agrees with the thermodynamic calculations. The three alloys absorb hydrogen at room temperature without any activation treatment, achieving a hydrogen uptake of about H/M = 2. The Pressure-Composition-Isotherms curves (PCI) has shown that increasing the Cr amount increases the equilibrium pressures, indicating that tunable H storage properties can be achieved by controlling the alloys’ Cr content.

Keywords: high entropy alloy; CALPHAD; BCC high entropy alloy; metal hydride; hydrogen storage; thermodynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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