Abstract
This paper presents the results of a study on the Mg-Al system aimed at enhancing hydrogen absorption kinetics through optimization of phase composition and synthesis parameters. To determine the optimal synthesis conditions, three- dimensional thermodynamic modeling was performed using Thermo-Calc, which enabled identification of the temperature–composition stability regions of the Mg 17 Al 12 intermetallic phase while preserving the Mg solid solution. Based on these results, mechanical alloying of powders followed by spark plasma sintering at 350 ℃ was carried out. X-ray diffraction analysis confirmed that the experimentally obtained phase composition is consistent with the predicted results. Samples containing an optimal fraction of Mg 17 Al 12 (30 wt.%) exhibited a twofold increase in hydrogen absorption rate compared to pure Mg at 300 ℃ and a pressure of 20 bar. The obtained results demonstrate the effectiveness of combining thermodynamic modeling with high-intensity synthesis techniques for the development of solid-state hydrogen storage materials with improved kinetic performance.