Evaluations of Microstructure and Hydrogenation Properties on Mg2NiHx Hydrogen Absorbing Alloys by Hydrogen Induced Mechanical Alloying
In order to fabricate high efficiency, light-weight hydrogen storage materials in an economical way, we have been made to propose a new mechanical alloying process by high-pressure hydrogen induced planetary ball milling(HIMA) using Mg and Ni chips. Microstructural evaluations of the Mg-Ni-H systems synthesized were investigated by scanning electron microscopy and the transmission electron microscopy. X-ray diffraction analysis was also made to characterize the lattice constant, crystallite size and misfit strain. The hydrogenation properties of the particles synthesized were evaluated by automatic PCI (pressure-composition-isotherm). Adopting 66:1 BCR (ball to chips mass ratio) for HIMA process, fully hydrogenated alloys were obtained after 96 hrs of milling, resulting in total hydrogen content of 2.25 mass%.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
W. G. Kim et al., "Evaluations of Microstructure and Hydrogenation Properties on Mg2NiHx Hydrogen Absorbing Alloys by Hydrogen Induced Mechanical Alloying ", Materials Science Forum, Vols. 544-545, pp. 311-314, 2007