Effects of nanometer-scale structure on hydriding properties of Mg-Ni alloys: A review

Shin Ichi Orimo, Hironobu Fujii

Research output: Contribution to journalReview articlepeer-review

120 Citations (Scopus)


The materials, which are produced by mechanical grinding/alloying, possess superior hydriding properties depending on their nanometer-scale structures. In this review paper, we present our recent works on the hydriding properties and nanometer-scale structures of some mechanically produced Mg-Ni alloys. The first topic is the properties of some nanostructured Mg2Ni (Mg-33 at%Ni) consisting of nanometer-scale crystallite (intra-grain) and inter-grain regions. In this system, the existence of the inter-grain region gives rise to notable hydriding properties of the nanostructured Mg2Ni such as the enhanced hydrogen dissolution and low-temperature dehydriding. The second topic is the properties of the alloys Mg-33, 38, 43 and 50 at% Ni in which a different amount of the amorphous (a-)MgNi phase depending on Ni content is homogeneously dispersed around nanometer-scale Mg2Ni crystallites. In this system, the total hydrogen content increases with increasing Ni content. This experimental result is well explained by a model based on three nanostructural constituents of these alloys and their hydriding properties.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
Issue number3
Publication statusPublished - 1998


  • A. nanostructured materials
  • B. Hydrogen storage
  • C. Mechanical alloying and milling
  • D. Grain boundaries
  • Structure


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