Composition design, synthesis and hydrogen storage ability of multi-principal-component alloy TiVZrNbTa

• Published in: Journal of alloys and compounds 2022-04, Vol.901, p.163638, Article 163638
• Main Authors: Zadorozhnyy, V., Tomilin, I., Berdonosova, E., Gammer, C., Zadorozhnyy, M., Savvotin, I., Shchetinin, I., Zheleznyi, M., Novikov, A., Bazlov, A., Serov, M., Milovzorov, G., Korol, A., Kato, H., Eckert, J., Kaloshkin, S., Klyamkin, S.
• Format: Article
• Language: English
• Subjects: Alloy powders; Alloys; Amorphization; Arc-melting; Body centered cubic lattice; Electric arc melting; Electron beam melting; Face centered cubic lattice; Hydrogen storage; Hydrogenation; Mechanical alloying; Mechanical tests; Multi-principal-component alloys; Pendant drop melt extraction; Single phase; Synthesis; Thermal analysis; Thermodynamic model; Thermodynamic models; X ray powder diffraction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.163638

•Thermodynamic model of single-phase high entropy alloys formation was developed.•Single-phase TiVZrNbTa equiatomic alloy was synthesized by various techniques.•Effect of synthesis method on alloy hydrogenation behavior was examined.•Alloy synthesis from melt results in improved stability upon hydrogenation. A thermodynamic model was proposed to assess the feasibility of the synthesis of single-phase multi-principal-component alloy. Based on this model, single-phase TiVZrNbTa equiatomic alloys with body centered cubic (BCC) structure were obtained by arc melting (AM), electron beam melting with pendant drop melt extraction (EBM-PDME) and mechanical alloying (MA). The alloys were characterized by powder X-ray diffraction, scanning and transmission electron microscopy, thermal analysis and mechanical testing. The hydrogenation behavior of the synthesized materials was studied by a volumetric method. It was found that for AM and EBM-PDME alloys a complete BCC-to-FCC structure transformation occurs upon hydrogenation, and hydrogen concentration in the hydrides formed reaches 1.5 H/M (1.6 wt%). MA alloy undergoes partial amorphization with maximum hydrogen absorption capacity of 0.9 wt%.