Fig. 1 a Measured XRD profiles of the cold-rolled Pd-H alloys with different H/Pd ratios and well-annealed Pd, bWilliamson-Hall plots for the diffraction patterns of cold-rolled alloys and well-annealed Pd [10]

 Fig. 2Concentration of the trapped hydrogen c t at lattice defects in cold-rolled Pd versus the chemical potential μH of H in Pd for samples with different H contents during deformation [29]

Fig. 3 Development of the dislocation density of cold-rolled Pd with increasing H content during cold rolling. The measurements were performed by two different methods: interpretation of the diffraction patterns of the samples using the method of Williamson-Hall plots and measurement of the relative dislocation density by evaluating the diffusion time of H through the Pd samples [29]

Fig. 4 a Vickers hardness (Hv) as a function of the initial H/Pd ratio, b linear fit of the measured Hv to square root of the measured dislocation density [28]

Fig. 5 The density of dislocations a and the concentration of deformation-induced vacancies b plotted as a function of the hydrogen concentration in the pre-charged samples [30]

Fig. 6 a True stress-strain curves of Pd and Pd-H alloys with different H concentrations, b linear fitting on ln σ tr-lnε tr curves and the resulting strain-hardening exponent n for Pd and Pd-H alloys [11]

Fig. 7 Stress-strain curves of H-free and H-charged Ni tested at different conditions: a room temperature, strain rate 3.33 × 10-4 s-1, b room temperature, strain rate 8.33 × 10-3 s-1 [35]