Metallurgical considerations in the production and use of FeTi alloys for hydrogen storage

Hydriding alloys based on the intermetallic compound FeTi have potential for the safe and convenient storage of hydrogen, both for mobile and stationary applications. Optimum technical and economic use of these alloys requires an understanding of the physical metallurgy of the system and its relation to the hydriding behavior. An introduction is provided to some of the metallurgical factors that affect hydriding behavior in FeTi and related alloys. Properties considered are hydrogen storage capacity, activation, decrepitation (particle size breakdown) and hydride stability (dissociation pressure).