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Ershova, O. G.; Dobrovolsky, V. D.; Solonin, Yu. M.
Powder metallurgy and metal ceramics, 09/2023, Letnik: 62, Številka: 5-6Journal Article
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 MgH 2 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 MgH 2 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 MgH 2 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 MgH 2 is not established. The average rate of the reaction does not depend on the hydrogen concentration and is equal to the rate constant k = = k 0 exp(–Ea/RT) (the Arrhenius equation). The tested materials showed high potential as hydrogen storage alloys, especially for stationary applications.
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