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Structural evolutions of the mechanically alloyed Al70Cu20Fe10 powders

Abstract

Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al70Cu20Fe10 were mechanically alloyed in a planetary ball mill for 80 h. Subsequent annealing of the as-milled powders were performed at 600–800°C temperature range for 4 h. Structural characteristics of the mechanically alloyed Al70Cu20Fe10 powders with the milling time and the heat treatment were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and differential thermal analysis (DTA). Mechanical alloying of the Al70Cu20Fe10 did not result in the formation of icosahedral quasicrystalline phase (i-phase) and a long time milling resulted in the formation of β-Al(Cu,Fe) solid solution phase (β-phase). The i-phase was observed only for short-time milled powders after heat treatment above 600°C. The β-phase was one of the major phases in the Al70Cu20Fe10 alloy. The w-Al7Cu2Fe1 phase (w-phase) was obtained only after heat treatment of the short-time milled and unmilled samples. The present investigation indicated that a suitable technique to obtain a large amount of quasicrystalline powders is to use a combination of short-time milling and subsequent annealing.

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Correspondence to BARIŞ AVAR.

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GÖĞEBAKAN, M., AVAR, B. Structural evolutions of the mechanically alloyed Al70Cu20Fe10 powders. Pramana - J Phys 77, 735–747 (2011). https://doi.org/10.1007/s12043-011-0091-6

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  • DOI: https://doi.org/10.1007/s12043-011-0091-6

Keywords.

  • Al–Cu–Fe alloy
  • quasicrystals
  • mechanical alloying
  • heat treatment

PACS Nos

  • 81.20.Ev
  • 81.40.−z
  • 81.70.Pg