Cooperative dehydriding mechanism in a mechanically milled Mg-50 mass% ZrMn2 composite

• Published in: Journal of alloys and compounds Vol. 455; no. 1-2; pp. 385 - 391
• Main Authors: MAKIHARA, Y, UMEDA, K, SHOJI, F, KATO, K, MIYAIRI, Y
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 08-05-2008
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Chemical and electrochemical properties; Energy; Exact sciences and technology; Fuels; Hydrogen; Metals. Metallurgy; Manganèse alloy; Scanning electron microscopy; Hydrogen storage; Interphase; Zirconium alloy; X-ray diffraction; Differential thermal analysis; Desorption; Nanostructure; Hydrogen absorbing materials; Nanostructures; Mechanical alloying; Controlled atmosphere; X ray diffraction; Composite material; Hydridation; Transition metal alloy; Magnesium; Thermal analysis
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2007.01.109

Structural and hydriding/dehydriding properties of the Mg-50 mass% ZrMn2 composite synthesized by reactive mechanical milling (RMM) method in hydrogen atmosphere are investigated by XRD, SEM/EDS and TG/DTA measurements. The effects of rotational speed and the milling time on the hydriding/dehydriding properties are examined in order to find out the most efficient milling condition for hydrogen storage of the composite. The composite prepared by RMM at 400 rpm for 1 h absorbs hydrogen rapidly at room temperature, where the composite hydride composed of MgH2, Mg and ZrMn2Hx is formed, and desorbs 2.6 mass% hydrogen at around 275 deg C without decomposition. Cooperative dehydriding mechanism originated in the elastic interaction between MgH2 and ZrMn2Hx through their interface boundary is proposed for the composite.