Influence of elemental diffusion on low temperature formation of MgH2 in TiMn1.3T0.2Mg (T = 3d-transition elements)

K. Yamamoto, S. Tanioka, Y. Tsushio, T. Shimizu, T. Morishita, S. Orimo, H. Fujii

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14 Citations (Scopus)

Abstract

In order to examine the influence of the elemental diffusion from the host compound into the Mg region on low temperature formation of MgH2, we have investigated the hydriding properties and the microstructures of the composite materials TiMn1.3T0.2-Mg (T=V, Cr, Mn, Fe, Co, Ni and Cu). MgH2 is formed at 353 K in all composite materials. Of all the substitutions, the amount of MgH2 is the largest in the case of the Cu substitution, which originates from the existence of the Mg-Mg2Cu eutectic formed by Cu diffusion from the host compound TiMn1.3Cu0.2 into the Mg region during the liquid phase sintering. In addition, the hydrogen capacity of TiMn1.3Cu0.2-Mg (that is TiMn1.3Cu0.1-(Mg+Mg2Cu) after the sintering) easily saturates in comparison with TiMn1.5-(Mg+Mg2Cu) without Cu diffusion. It is concluded that Cu diffusion promotes the mobility of hydrogen atoms at the complex interface between the host compound and the Mg region.

Original languageEnglish
Pages (from-to)144-150
Number of pages7
JournalJournal of Alloys and Compounds
Volume243
Issue number1-2
DOIs
Publication statusPublished - 1996 Oct 15
Externally publishedYes

Keywords

  • Complex interface
  • Composite material
  • Elemental diffusion
  • Liquid phase sintering
  • Mg-MgCu eutectic

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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