The effect of Al on thermal stability and kinetics of decomposition of MgH2 prepared by mechanochemical reaction at different conditions

摘要: Abstract This work is directed at decreasing decomposition temperature of MgH2. In accordance with the theoretical predictions, hydride solid solution Al in Mg should decompose lower compared to that MgH2, and numerous experiments indicate thermodynamic stability depends on methods conditions its synthesis. Therefore, goal this article study possibility obtaining aluminum magnesium by different technological approaches. Three mechanical composite alloys derived approaches are studied employing X-ray diffraction (XRD), scanning electron microscopy (SEM) thermodesorption spectroscopy (TDS) methods. XRD Rietveld analysis reveals hydrogenation a Mg + 10 wt% powder means reactive milling hydrogen atmosphere as well from gaseous phase after for 20 h argon leads formation aluminum-free MgH2 Mg17Al12 phase. Our TDS studies (at PH2 = 0.1 MPa) additives 10 wt% do not lead prepared mechanochemical reaction conditions.