An in situ bulk Zr58Al9Ni9Cu14Nb10 quasicrystal-glass composite with superior room temperature mechanical properties

J. B. Qiang, W. Zhang, Guoqiang Xie, Hisamichi Kimura, C. Dong, A. Inoue

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

An in situ bulk Zr58Al9Ni9Cu14Nb10 quasicrystal-glass composite has been fabricated by means of copper mould casting. The microstructure and constituent phases of the alloy composite have been analyzed by using X-ray diffraction, transmission electron microscopy and high-resolution transmission electron microscopy. Icosahedral quasicrystals were found to be the majority phase and the grain size is in half-μm scale. In between the I-phase grains is a glassy phase. Optical microscopy and scanning electron microscopy revealed that the as-cast alloys were pore-free. The microhardness of the composite is about 5.90 ± 0.30 GPa. The room temperature compression stress-true strain curve exhibits a 2% elastic deformation up to failure, and a maximum fracture stress of 1850 MPa at a quasi-static loading rate of 4.4 × 10-4 s-1. The mechanical property is superior to the early developed quasicrystal alloys, and is comparable to Zr-based bulk metallic glasses and their nanocomposites. The quasicrystal-glass composite exhibits basically a brittle fracture mode at room temperature.

Original languageEnglish
Pages (from-to)1197-1201
Number of pages5
JournalIntermetallics
Volume15
Issue number9
DOIs
Publication statusPublished - 2007 Sep
Externally publishedYes

Keywords

  • A. Composites
  • A. Intermetallics, miscellaneous
  • B. Fracture stress
  • B. Mechanical properties at ambient temperature
  • C. Casting

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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