Phase components of the sintered Mg-X WT% LaNi5 (X = 20-50) composites and their hydrogenation properties

D. Sun, F. Gingl, H. Enoki, D. K. Ross, E. Akiba

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Mg-x wt% LaNi5 (x = 20-50) composite materials were prepared by sintering powder mixtures of magnesium and LaNi5 at 973 K for 1 h. The microstructures were studied using optical microscopy, X-ray diffraction and scanning electron microscopy. After sintering, the samples with x = 20 and 30 consisted of Mg, Mg2Ni and LaMg12. As x increased to 40, the La2Mg17 phase started to form. With further increase in x to 50, Mg and LaMg12 vanished, and Mg2Ni and La2Mg17 were the major phases. The phase abundance as a function of composition was determined by Rietveld analysis. It is also found that LaMg12 is not a well-defined stoichiometric compound but exists within a composition range. Compared with pure magnesium, all samples were more easily activated under hydrogen pressure of 5 MPa at 623 K. From the viewpoint of pressure-composition isotherms (P-C isotherms) of hydrogenation, the sintered Mg-x wt% LaNi5 (x = 20-50) composites work as a mixture of pure magnesium and Mg2Ni.

Original languageEnglish
Pages (from-to)2363-2372
Number of pages10
JournalActa Materialia
Issue number9
Publication statusPublished - May 29 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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