Synthesis of quasicrystal phases by mechanical alloying of Ti45+xZr 38-xNi17 (-4≤ x ≤16) powder mixtures, and their hydrogen storage properties

Akito Takasaki, Naoki Imai, Kenneth F. Kelton

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

Mechanical alloying of Ti45+xZr38-xNi17 (-4 ≤ x ≤ 16) elemental powder mixtures leads to the formation the amorphous phase, but subsequent annealing at 833 K causes the formation of icosahedral (i) quasicrystal and the Ti2Ni-type crystal phases. The α-Ti phase is also produced in Ti-rich powders after annealing. Both the quasilattice constant of the i-phase and the lattice parameter of the Ti 2Ni-type crystal phase decrease monotonically with increasing substituted amount of Ti because of the smaller radius of the Ti atom. The maximum hydrogen concentration in the i-phase in all powder compacts, after electrochemical hydrogenation in a KOH solution, is almost the same, about 63 at% ([H] / [M] ≈ 1.7). The onset temperature of hydrogen desorption is about 570 K (at a heating rate of 5 K/min) for all powders, but the temperature for the maximum hydrogen desorption rate increases with increasing Ti concentration in the powders, suggesting that some hydrogen atoms might be more strongly bound in the quasilattice where the original Zr sites become occupied by Ti atoms.

Original languageEnglish
Pages (from-to)351-356
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume805
Publication statusPublished - 2003 Dec 1
EventQuasicrystals 2003 - Preparation, Properties and Applications - Boston, MA., United States
Duration: 2003 Dec 12003 Dec 3

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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