HYDRIDING CHARACTERISTICS OF FETI-BASED TI-FE-V-MN ALLOY

The hydrogen absorption characteristics of the FeTi-based alloy Ti0.457Fe0.447-V0.048Mn0.048 were studied by means of X-ray diffraction, EDS and AES. The alloys' resistance to contamination with oxygen and water vapor was determined. Addition of 5 at.% of manganese and vanadium does not change the absorption capacity but gives rise to a new phenomenon of dissociation plateau pressure values ''smoothing'' so that the isotherms exhibit no distinct region of monohydride existence. It was found that upon hydriding the surface composition changes greatly. The added alloying metals prevent the iron atoms from oxidation and play a catalytic role in the hydrogenation process.Chemistry, PhysicalSCI(E)