Hydrogen absorption in an icosahedral ZnMgY alloy

A. P. Tsai, A. Niikura, K. Aoki, T. Masumoto

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Hydrogen absorption in a stable icosahedral (i-) Zn50Mg42Y8 alloy has been studied by X-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The i-phase decomposed to a hexagonal Zn2Mg Laves phase, YH3 and MgH2 after hydrogenation under 3 MPa hydrogen pressure at 573 K for 259.2 ks. Two stages of hydrogenation for the i-phase were identified; i-ZnMgY+xH2→i-ZnMgYH2x in the initial stage and then i-ZnMgYH2x+H2→Zn2Mg+YH 2+MgH2. DSC curve of the fully hydrogenated (3 MPa, 573 K, 259.2 ks) sample revealed an endothermic peak around 730 K corresponding to the hydrogen desorption. The transformations between the icosahedral and crystalline phases due to hydrogen absorption and desorption are reversible.

Original languageEnglish
Pages (from-to)90-93
Number of pages4
JournalJournal of Alloys and Compounds
Volume253-254
DOIs
Publication statusPublished - 1997 May 20
Externally publishedYes

Keywords

  • Hydrogenation
  • Quasicrystal
  • Reversible reaction
  • Zinc-magnesium-yttrium

ASJC Scopus subject areas

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

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