Hydrogen diffusivities as a measure of relative dislocation densities in palladium and increase of the density by plastic deformation in the presence of dissolved hydrogen

Mechanical stress and stress release channels in 10–350 nm palladium hydrogen thin films with different micro-structures

“…This conclusion is in line with recent TEM observations of the re-organization of dislocation networks in cold-rolled Pd in the presence of hydrogen [48]. For nanocrystalline films with their stress preserving grain boundaries one can further think of processes such as the sliding of grains next to dislocation mediated mechanisms [49].…”

Discerning enhanced dislocation plasticity in hydrogen-chargedα-iron nano-crystals

“…However, the H-charged samples show a rise in the dislocation density during plastic flow, which indicates that H enhances dislocation plasticity even at high H concentrations similar to the ones considered in the current study. These results are in qualitative agreement with recent TEM observations that unlike in H-free crystals, very dense dislocation structures form in H-charged nickel, [6] palladium, [9] and αFe. [7,8] The dislocation microstructure, for the 80 nm simulation cells with initial dislocation density of ρ 0 = 12 × 10 15 m −2 , at 0% and 10% strain are shown in Figure 4(a) and 4(b), respectively, for both the H-free and H-charged simulation cells.…”

“…[6][7][8] It was also shown that the degree of increase in dislocation density is a function of H concentration. [9] These studies promote the need to reevaluate the effect of H-atoms on dislocation plasticity in high-pressure H environments.…”

Production of nanograin microstructure in steel nanocomposite

“…Traditionally there are some methods such as Xray diffraction (XRD) [38][39][40][41], transmission electron microscopy (TEM) [42,43], electron backscatter diffraction (EBSD) [44,45], electron channeling contrast imaging [46], and hydrogen diffusivities [47]. Recently, the dislocation density has been estimated from hardness measurement [48,49].…”