Hydrogen storage characteristics of Ti45Zr38Ni 17-xCox (x = 4, 8) alloy and quasicrystal powders produced by mechanical alloying

Akito Takasaki, A. Zywczak, Gondek, H. Figiel

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The effect of substitution of Co for Ni on hydrogen storage characteristics of Ti-Zr-Ni/Co powders (Ti45Zr38Ni17- xCox (x = 4, 8)) produced by mechanical alloying (MA) was investigated. The final product after MA was amorphous for all the powders, but subsequent annealing caused the formation of the icosahedral quasicrystal (i) phase with a Ti2Ni type crystal and a C14 like Laves phases. The amount of i-phase decreased, and reversely those of Ti2Ni and the Laves phases increased with increasing the amount of Co. After hydrogenation at 573 K and at an initial hydrogen pressure of 3.8 MPa, the maximum hydrogen concentration for the annealed powders reached was about 58 at%, and all the phases in the powders transformed to metallic hydrides ((Zr,Ti)H2, Ni(Zr,Ti)H3 and Co(Zr,Ti)H3). Because of the formation of several hydrides, accelerated hydrogen desorption occurred at several temperatures. The activation energies for hydrogen desorption varied from about 70 kJ/mol to 180 kJ/mol.

Original languageEnglish
Pages (from-to)S216-S218
JournalJournal of Alloys and Compounds
Volume580
Issue numberSUPPL1
DOIs
Publication statusPublished - 2013 Apr 10

Keywords

  • Hydrides
  • Hydrogen storage
  • Laves phase
  • Mechanical alloying
  • Quasicrystal
  • TiNi

ASJC Scopus subject areas

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

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