No abstract

Dehydrogenation of nanocrystalline TiH 2 , produced by pulverization of commercially available powder, has been examined in detail by a combination of thermal analysis, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The dehydrogenation to form Ti occurs as a two-step process involving the formation of an intermediate phase, TiH. In-situ experiments on dehydrogenation inside a transmission electron microscope reveal the possibility of a powder-metallurgy process for consolidation of Ti components by vacuum annealing of nanocrystalline TiH 2 at ϳ0.5T m , where T m is the melting point of Ti. Near-full densification of Ti has been achieved by sintering nanocrystalline TiH 2 under vacuum at ϳ0.5T m .