Mechanical alloys Mg + 10 wt.% Ti and Mg + 5 wt.% Ti + 5 wt.% TiC (MAs) were synthesized by reactive mechanical alloying (RMA). Thermal stability and hydrogen desorption kinetics of the nanosized MgH₂ phase in the obtained MAs were examined by means of thermal desorption spectroscopy at a hydrogen pressure of 0.1 MPa. The stabilizing effect of Ti on the nanocrystalline structure and growth of the crystallites (grains) of the MgH₂ phase during the cycling was also evaluated. It has been established that the complex doping by Ti and TiC leads to a significant improvement in the desorption of hydrogen in the nanosized MgH₂ phase of MAs. The role of Ti and TiC as alloying elements in improving the hydrogen desorption kinetics of MAs was studied. The catalytic effect of adding 5 wt.% Ti + 5 wt.% TiC to magnesium in improving the kinetics of hydrogen desorption is significantly lower than the catalytic effect of adding 10 wt.% Ti. Due to such alloying, the decrease in the thermodynamic stability of MgH₂ is not established. The average rate of the reaction does not depend on the hydrogen concentration and is equal to the rate constant k = = k₀ exp(–Ea/RT) (the Arrhenius equation). The tested materials showed high potential as hydrogen storage alloys, especially for stationary applications.

机械合金 Mg + 10 wt.% Ti 和 Mg + 5 wt.% Ti + 5 wt.% TiC (MAs) 通过反应机械合金化 (RMA) 合成。在0.1 MPa氢气压力下，通过热解吸光谱研究了所得MA中纳米MgH₂相的热稳定性和氢解吸动力学。还评估了循环过程中 Ti 对 MgH₂ 相纳米晶结构和微晶（晶粒）生长的稳定作用。研究表明，Ti 和 TiC 的复合掺杂可显着改善 MAs 纳米级 MgH₂ 相中氢的脱附。研究了 Ti 和 TiC 作为合金元素在改善 MAs 氢解吸动力学中的作用。在镁中添加5 wt.% Ti+5 wt.% TiC对改善氢解吸动力学的催化效果明显低于添加10 wt.% Ti的催化效果。由于这种合金化，MgH₂的热力学稳定性没有降低。反应的平均速率不依赖于氢气浓度，等于速率常数 k = = k₀ exp(–Ea/RT) （阿伦尼乌斯方程）。测试的材料显示出作为储氢合金的巨大潜力，特别是对于固定应用。