V-BASED SOLID-SOLUTION ALLOYS WITH LAVES PHASE NETWORK - HYDROGEN ABSORPTION PROPERTIES AND MICROSTRUCTURE

Hydrogen absorption-desorption properties, microstructures and electro de properties of V-based solid solution alloys (V3TiNi0.56Hfx, x = 0.0 46 and 0.24) were reported. In these alloys a Laves phase was precipit ated, forming a three-dimensional network along grain boundaries of a V-based solid solution main phase. Cracking was observed to occur in a nd around the Laves phase after several charge-discharge cycles. The i ncrease in fresh surface area was very useful in enhancing the high-ra te capability of the electrode.