Experimental studies on the kinetics of the interaction of hydrogen with palladium in the α-PdH n alloy

The article presents the results of an experimental study on the kinetics of cantilever deformation in the α-region of the α-PdHn alloy, conducted during successive hydrogen injections with the same concentration increase and different gas supply rates. It was established that each subsequent hydrogen injection leads to an increase in the time to achieve maximum bending and its duration, which is associated with the accumulation of hydrogen in the crystal lattice and the growth of internal concentration stresses. For the first time, a pronounced plateau effect was experimentally observed after achieving maximum bending, indicating the establishment of thermobaroelastic equilibrium between the processes of hydrogen penetration and the mechanical reaction of the material. Exponential relationships between the bending magnitude and the time to achieve it, as well as logarithmic relationships between the bending and the hydrogen supply rate, were established. The obtained patterns can be used to predict the behavior of palladium alloys in a hydrogen environment and to develop hydrogen concentration sensors.