Abstract
The hydriding process of Fe–Ti alloys has been investigated by means of a volumetric method, differential scanning calorimetry, electron probe X-ray microanalysis and Auger electron spectroscopy. It was found that the hydrogenation became easier with increasing density of phase boundaries between the FeTi and β Ti phases and the hydrogenation of the FeTi phase started from the phase boundaries. It is concluded that the air exposed alloys consisting of the FeTi and β Ti phases are hydrogenated mainly by a mechanism of phase boundary diffusion of hydrogen atoms in the initial stage of hydriding process.
