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Mass Production of Mg based Hydrogen Absorbing Alloys and Evalution of Hydrogenation and Degradation Properties by Hydriding/Dehydriding Cyclic Test  

Ha, Won (Grand. School of Sungkyunkwan Univ.)
Lee, Sung-Gon (Grand. School of Sungkyunkwan Univ.)
Hong, Tae-Whan (Grand. School of Sungkyunkwan Univ.)
Kim, Young-Jig (Dept. of Advanced materials Engineering, Sungkyunkwan Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.1, 2002 , pp. 13-23 More about this Journal
Abstract
Hydrogenation properties of Mg-Ni and Mg-Ti-Ni alloys were investigated by Pressure-Composition Isotherm (PCI) test. Those alloys were fabricated by a new alloying method, Rotation-Cylinder Method (RCM). The as-cast microstructure of Mg-10 mass% Ni alloy consists of an island-like hydride forming $\alpha$-Mg phase and the eutectic structure. After 350 cyclic tests, Mg-lO mass % Ni alloy was pulverized into fine particles of 100 nm. The fine particles, which have a large specific surface area, are highly reactive with hydrogen. However, extreme pulvehzation can separate Mg from $Mg_2Ni$ in the eutectic structure, so $Mg_2Ni$ of the eutectic structure cannot behave as a dissociated hydrogen supplier.
Keywords
Mass production; Mg-Ni; Mg-Ti-Ni; Hydrogen absorbing alloy; Degradation;
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