Synthesis of amorphous and quasicrystal phases by mechanical alloying of Ti45Zr38Ni17 powder mixtures, and their hydrogenation

A. Takasaki, C. H. Han, Y. Furuya, K. F. Kelton

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Mechanical alloying of Ti45Zr38Ni17 powder mixture forms an amorphous phase, but subsequent annealing causes the formation of an icosahedral (i) phase. The maximum hydrogen concentration that can be loaded at 573 K at a hydrogen pressure of 3.8 MPa is the same ([H]/[M] ≈ 1.5) for the amorphous and i-phase powders. With hydrogenation, the i-phase is almost stable, forming no hydrides, whereas the amorphous phase transforms to a fcc hydride. The activation energy for hydrogen desorption for the i-phase is about 127 kJ mol-1, which is lower than that for the amorphous phase, suggesting that the i-phase powder may have better properties for hydrogen-storage applications.

Original languageEnglish
Pages (from-to)353-361
Number of pages9
JournalPhilosophical Magazine Letters
Volume82
Issue number6
DOIs
Publication statusPublished - 2002 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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