HREM observation and high-pressure composition isotherm measurement of Ti<inf>45</inf>Zr<inf>38</inf>Ni<inf>17</inf> quasicrystal powders synthesized by mechanical alloying

Tomoki Tominaga, Akito Takasaki, Tsuyoshi Shibato, Konrad ͆wierczek

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2 Citations (Scopus)

Abstract

Abstract Elemental powders consisted of chemical composition of Ti<inf>45</inf>Zr<inf>38</inf>Ni<inf>17</inf> were mechanical alloyed and annealed subsequently, and the microstructures were characterized by high-resolution electron microscopy (HREM) and an X-ray diffractometry, and hydrogen absorption and desorption pressure-composition (PC) isotherms were measured at 523 K, 573 K and 623 K by a Sieverts type apparatus. The annealing after mechanical alloying (MA) caused formation of an icosahedral quasicrystal with a Ti<inf>2</inf>Ni type crystal phases. 5 or 10-fold rotational symmetry, which is prohibited to normal crystals, was observed by HREM in a digital diffractogram and an simulated atomic arrangement derived from the digital diffractogram. The hydrogen storage capacity (hydrogen to metal atom ratio: H/M) at 523 K was about 1.3, which decreased with increasing hydrogenation temperatures. All the PC isotherms were steep, and no plateau pressure was observed.

Original languageEnglish
Article number32989
Pages (from-to)S292-S294
JournalJournal of Alloys and Compounds
Volume645
Issue numberS1
DOIs
Publication statusPublished - 2015 Aug 11

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Keywords

  • HREM
  • Mechanical alloying
  • Pressure-composition isotherm
  • Quasicrystal
  • Titanium-zirconium-nickel alloy

ASJC Scopus subject areas

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

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