Influence of Ni or Mn on hydrogen absorption–desorption performance of V–Ti–Cr–Fe alloys

The hydrogen desorption performance of the BCC alloys V55−xTi20.5Cr18.1Fe6.4Nix (x = 0.1, 0.3, 0.5 and 1) and V55−yTi20.5Cr18.1Fe6.4Mny (y = 0.3, 0.7 and 1) were evaluated by pressure-composition-temperature tests. Their hydrogen absorption kinetic properties were studied through hydrogen absorption curves. The crystallographic structures of these alloys before hydrogen absorption and after hydrogen desorption PCT test were identified by X-ray diffraction (XRD). The mechanism affecting their hydrogen absorption–desorption characteristics by Ni or Mn were discussed.