High-pressure x-ray diffraction of icosahedral Zr-Al-Ni-Cu-Ag quasicrystals

Jianzhong Jiang, Karel Saksl, Helge Kildahl Rasmussen, T. Watanuki, N. Ishimatsu, O. Shimomara

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Abstract

The effect of pressure on the structural stability of icosahedral Zr-Al-Ni-Cu-Ag quasicrystals forming from a Zr65Al7.5Ni10Cu7.5Ag10 metallic glass with a supercooled liquid region of 44 K has been investigated by in situ high-pressure angle-dispersive x-ray powder diffraction at ambient temperature using synchrotron radiation. The icosahedral quasicrystal structure is retained up to the highest hydrostatic pressure used (approximately 28 GPa) and is reversible after decompression. The bulk modulus at zero pressure and its pressure derivative of the icosahedral Zr-Al-Ni-Cu-Ag quasicrystal are 99.10+/-1.26 GPa and 4.25+/-0.16, respectively. The compression behavior of different Bragg peaks is isotropic and the full width at half maximum of each peak remains almost unchanged during compression, indicating no anisotropic elasticity and no defects in the icosahedral Zr-Al-Ni-Cu-Ag quasicrystals induced by pressure.
Original languageEnglish
JournalApplied Physics Letters
Volume79
Issue number8
Pages (from-to)1112-1114
ISSN0003-6951
DOIs
Publication statusPublished - 2001

Bibliographical note

Copyright (2001) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • HIGH-STRENGTH
  • QUASI-CRYSTALLINE PHASE
  • STABILITY
  • APPROXIMANT PHASES
  • ALLOYS
  • M = AG
  • BULK GLASS
  • PD METALLIC GLASSES
  • SUPERCOOLED LIQUID REGION
  • PRECIPITATION

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