The temperature induced hydrogen absorption-desorption cycling of FeTi and $Fe_{0.85}TiMn_{0.15}$ intermetallic compounds were performed to study the potential applications of alloys as heat pump and hydrogen storage materials.
FeTi and $Fe_{0.85}TiMn_{0.15}$ alloys were degraded 23.2% and 9.95% respectively of its virgin hydrogen-transfer capacity. And hydrogenation properties of hysteresis, slopping phenomena and kinetics of reaction were also degraded.
The degradation mechanism and recovery of the degraded samples are also studied by means of thermal analysis technique and annealing, finding the formation of stable hydrides and the hydrogen occupied interstial sites.
Detailed analysis of the intrinsic degradation of FeTi and $Fe_{0.85}TiMn_{0.15}$ are also presented.