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 language | English |
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Pages (from-to) | 1197-1201 |
Number of pages | 5 |
Journal | Intermetallics |
Volume | 15 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2007 Sep |
Externally published | Yes |
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