Synthesis and microhardness measurement of Ti–Zr–Ni nanoquasicrystalline phase
DOI: 10.1016/S0925-8388(02)00132-9
Title: Synthesis and microhardness measurement of Ti–Zr–Ni nanoquasicrystalline phase
Journal Title: Journal of Alloys and Compounds
Volume: 342
Publication Date: 14 August 2002
Start Page: 49
End Page: 52
Published online: online 4 March 2002
ISSN: 0925-8388
Affiliations:

  • a Department of Physics, B.H.U., Varanasi 221005, India

  • b Department of Metallurgical Engineering, B.H.U., Varanasi 221005, India
  • Abstract: dash;Zr–Ni forms one of the interesting systems of quasicrystals and related structures. It is the only system in Ti-based quasicrystalline phases which belongs to Bergman class and at the same time gives rise to a stable quasicrystalline structure. We report the formation of nanoquasicrystalline phase directly from melt spinning of molten Ti53Zr27Ni20 alloy. Such a phase has been obtained at an optimum copper wheel speed (40 m/s) and jet pressure of 90 atm. We have also measured the mechanical response of this material by the microhardness technique. It shows much better ductility, strength and fracture toughness than the usual alloy having micron-sized quasicrystalline phase. Even at higher load (200 g) no crack seems to appear. We do observe shear bands suggesting the better toughness of bulk material containing nanoquasicrystalline/nanocrystalline phase.
    Keywords: Quasicrystals; Bergman class; Ti–Zr–Ni

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