Microstructure and hydrogen absorption properties of nano-phase composite prepared by mechanical alloying of MmNi5-x(CoAlMn)x and Mg

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Pages (from-to)531-535
Journal / PublicationJournal of Alloys and Compounds
Publication statusPublished - 20 Dec 1999


TitleProceedings of the 1998 International Symposium on Metal-Hydrogen Systems - Fundamentals and Applications (MH98)
CityHangzhou, China
Period4 - 9 October 1998


In this work high energy ball milling was used to prepare composite hydrogen storage alloy in the MmNi5-xMx-Mg system. X-ray diffraction and TEM analysis were used to characterize the microstructure of the composite alloy obtained by ball milling. It has been shown that the grain size of MmNi5-xMx and Mg components were reduced to nanometre range after about 20 h of milling. Besides, a Mm2Mg17 phase of nanometre size was also formed in the milling process. Thus, a composite alloy, referred to as nano-phase composite here, composed of MmNi5-xMx, Mg and Mm2Mg17 phase of nanometre size was obtained. Hydrogen storage behaviour of the nano-phase composite was compared with that of conventional MmNi5-xMx alloy by measuring PCT and kinetics. It showed that the hydrogen absorption properties were improved.

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