Ti-based BCC Alloy: Dehydrogenation Characterization Using Synchrotron and Neutron Diffraction

Abstract

Dehydrogenation of a BCC alloy of composition 52Ti-12V-36Cr doped with 4 wt.% Zr 7 Ni 10 was studied by diffraction using synchrotron and neutron radiations. In the case of synchrotron radiation dehydrogenation was imposed by raising the temperature while keeping the sample under vacuum. We found that prior to final dehydrogenation the FCC dihydride phase is becoming metastable. Neutron in-situ experiment was done by keeping the deuterided sample at 200°C and slowly reducing the pressure. This lead to a reduction of the occupation factor of deuterium in the FCC phase and an increase of the isotropic atomic temperature factor of deuterium.

MEASUREMENT OF THE ABSORPTION-BASED HYDROGEN STORAGE CAPACITY OF Ti0.95Zr0.05Cr0.8Mn0.8V0.2Ni0.2 ALLOY

“…Compared to gaseous and liquid storage systems, storage of hydrogen in metal hydrides (MH) exhibits several advantages [4][5][6][7][8]. The most important ones include mainly high volumetric density and low operating pressure; this represents significant improvement of the safety of applications thereof in the transportation segment, in various industries, or in households [9,10]. The development of novel MH materials requires the identification of their PCI (Pressure Concentration Isotherms) curves indicating the changes in the pressure depending on hydrogen concentration at a constant temperature [11][12][13].…”