Specific features of change of the plate shape in the formation of gradient alloys of palladium with hydrogen

Keywords

hydrogen, palladium, gradient alloy, saturation, concentration, thermo-baro-elastic-diffusion equilibrium.

Cite as

Lyubymenko О. М. Specific features of change of the plate shape in the formation of gradient alloys of palladium with hydrogen. Physicochemical Mechanics of Materials. 2022. 58(6), 108-114.

Abstract

The formation of temporary gradient α-PdH_n alloy at 320°С during the saturation of the α-PdH_n alloy with hydrogen at Δn = 0.01543 to 0.06172 Н/Pd for the change in the hydrogen content of palladium has been studied for the first time. It is shown experimentally that plate bending is completely reversible, the value of the maximum plate bending decreases when the alloy with a high hydrogen content in the plate is formed with reaching a plateau, lasting for 5 s in each experiment. It is shown that the results obtained indicate the manifestation of a progressive thermo-baro-elastic-diffusive equilibrium with inhibi­tion of hydrogen penetration into the plate and a corresponding progressive decrease in the growth rate of the gradient layer (α-PdH_n) responsible for bending. Hence, the synergistic nature of the three interrelated and interdependent kinetic processes of the change of the plate shape from gradient alloys α-PdH_0.01543, α-PdH_0.03086, α-PdH_0.04629, α-PdH_0.06172 is caused by diffusion hydrogen transport, redistribution of internal stresses in the plate during its bending (straightening) and corresponding restructuring of hydrogen concentration field, which changes internal conditions of hydrogen diffusion transport into the α-PdH_n alloy layers.

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