Paper Title:
Hydriding Properties of Mg2Ni Nanocomposites Produced by Low Energy Mechanical Alloying
  Abstract

Structure, microstructure and hydriding properties of mechanically alloyed 2Mg-Ni mixture were investigated. Two different nanocomposites were synthesized by mechanical alloying (MA) in a low-energy planetary mill, namely MN100 (100 h of milling) and MN200 (200 h of milling). The formation of nanocrystalline Mg2Ni was detected as a function of the milling time. An appropriate combination of MA plus annealing under mild conditions accomplishes the complete formation of Mg2Ni phase. The pressure-composition isotherms of the two samples reveal different hydrogen storage capacities and plateau slopes. In addition, the low temperature Mg2NiH4 (LT) formed by hydriding/cooling of MN100 h decomposes at 190 °C, whereas this hydride produced from MN200 first transforms to the high temperature Mg2NiH4 and then decomposes near 245 °C. The differences in the hydriding/dehydriding properties of MN100 and MN200 were associated with the microstructure and structure of the phases formed during MA followed by heating under argon/hydrogen.

  Info
Periodical
Edited by
Dílson S. dos Santos
Pages
52-58
DOI
10.4028/www.scientific.net/MSF.570.52
Citation
F. C. Gennari , M. R. Esquivel , "Hydriding Properties of Mg2Ni Nanocomposites Produced by Low Energy Mechanical Alloying ", Materials Science Forum, Vol. 570, pp. 52-58, 2008
Online since
February 2008
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