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

研究成果: Conference article査読

6 被引用数 (Scopus)


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.

ジャーナルMaterials Research Society Symposium - Proceedings
出版ステータスPublished - 2003
イベントQuasicrystals 2003 - Preparation, Properties and Applications - Boston, MA., United States
継続期間: 2003 12 12003 12 3

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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