V-BASED SOLID SOLUTION TYPE HYDROGEN STORAGE ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a hydrogen storage alloy in which plateau region can be flattened without depending on the content of V. SOLUTION: This V-based solid solution type hydrogen storage alloy is expressed by the general formula of VxTiyCrz wherein, as to the atomic rations of (x), (y) and (z), 0x=60, 1.0=z/y=2.0, and x+y+z=100}, uses a phase having a body-centered cubic structure as the main phase and contains C in the range of =1.0 wt.%. Thereby, a TiC phase is precipitated, and further, the compositional distribution of the main phase is made uniform Moreover, by jointly using heat treatment, the plateau region can be flattened without reducing the amount of hydrogen to be occluded.