Abstract
The kinetics and mechanism of hydrogen absorption in Ti 600 alloy were investigated at various temperatures (873 K ≤ T ≤ 1123 K ). The rate of hydrogen absorption and equilibrium hydrogen pressure increased with the increase of temperature. Because hydriding reaction is an exothermic reaction, solubility of hydrogen decreased with increasing temperature. The experiment results were interpreted from the time dependent hydrogen absorption curves using various rate equations to reveal the mechanism of the hydrogen absorption processes. The hydriding reaction rate constants were extracted from the time-dependent hydrogen absorption curves. The mechanism of hydriding reaction in different stages has been analyzed. It was found that the chemical reaction process dominated the hydrogen absorption process at 923K. The chemical reaction process and the three-dimensional diffusion process dominated the hydrogen absorption process at 973K or higher.
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