Hydrogen-Sorption Properties of the Alloy Ti$_{15.5}$Zr$_{30}$Mn$_{38}$V$_{5.5}$Cr$_{5.5}$Co$_{5.5}$ Based on the Laves Phase (Type $C$14)
V. A. Dekhtyarenko
G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
Received: 19.05.2023; final version - 26.07.2023. Download: PDF
Microstructure and phase composition of the cast Ti$_{15.5}$Zr$_{30}$Mn$_{38}$V$_{5.5}$Cr$_{5.5}$Co$_{5.5}$ alloy as well as the phase composition of hydrogenation and dehydrogenation products are investigated using the methods of x-ray phase analysis and scanning electron microscopy. As established, due to the partial replacement of manganese with cobalt, it is not possible to expand the area of existence of the Laves phase (type $C$14), since, in the phase composition of the studied alloy, a second intermetallic phase based on the Zr$_{2}$Co compound is formed. As determined, the change in the phase composition of the alloy does not affect significantly the kinetics of hydrogen absorption and desorption at the first sorption–desorption cycle. As established, the formed intermetallide based on the Zr$_{2}$Co compound interacts actively with hydrogen at room temperature and a hydrogen pressure of 0.23 MPa. As shown, the process of hydrogen release begins with the start of heating; at a temperature of 430°C, a reversible capacity of 95% is achieved.
Key words: Laves phase (type $C$14), intermetallic Zr$_{2}$Co, hydrogenation, dehydrogenation, hydrogen capacity.
URL: https://mfint.imp.kiev.ua/en/abstract/v45/i06/0743.html
DOI: https://doi.org/10.15407/mfint.45.06.0743
PACS: 61.05.cp, 61.66.Dk, 61.68.+n, 68.37.Hk, 68.43.Mn, 68.43.Nr, 82.80.Pv
Citation: V. A. Dekhtyarenko, Hydrogen-Sorption Properties of the Alloy Ti$_{15.5}$Zr$_{30}$Mn$_{38}$V$_{5.5}$Cr$_{5.5}$Co$_{5.5}$ Based on the Laves Phase (Type $C$14), Metallofiz. Noveishie Tekhnol., 45, No. 6: 743—755 (2023)