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Regular version of the site

Article

Diffusion-Thermal Phase Transformations in Titanium Hydride Containing a Multi-Barrier System of Hydrogen Traps

Inorganic Materials: Applied Research. 2021. Vol. 12. No. 5. P. 1206-1213.
Yastrebinsky R. N., Bondarenko G.G., Pavlenko V. I., Karnaukhov A. A.

Diffusion-thermal phase transformations in modified titanium hydride containing a multi-barrier
system of hydrogen traps are considered. Modification of titanium hydride was carried out by the method of
layer-by-layer electrochemical precipitation of metallic titanium and copper from organic and inorganic
solutions of their salts. The creation of a multilayer coating (Ti–Cu) on the surface of the titanium hydride by
the electrochemical precipitation method increases the thermal stability of the metal hydride system by
229.7°C. By using the methods of X-ray-phase, X-ray structural, and electron-probe microanalysis, it has
been shown that the phase composition of the modified titanium hydride in a temperature range 100–700°C
is constant. The most significant changes in the crystal lattice in the modified titanium hydride occur at a
temperature of 500 °C owing to hydrogenation of the modified titanium shell and blocking of the microcracks
of the surface with a copper coating; the period of the unit cell and the volume of the hydride-phase crystal
change. The highest concentration of hydrogen in the surface layer (up to 87.9%) occurs in the temperature
range of 300–500°C, which ensures the maximum defect density in the crystal lattice. At 700°C, one can
observe a decrease in the dislocation density and a decrease in the crystal cell parameters associated with the
annealing mode of titanium hydride and hydrogen thermal diffusion into the volume of material. The metallic
titanium precipitated on the titanium hydride surface is an effective structural trap of hydrogen diffusing
into the surface layers during thermal heating; the creation of an additional protective copper sheath prevents
thermal diffusion of hydrogen into the environment.