Abstract

The present research aimed to characterize the microstructure of icosahedral quasicrystalline phase (i-phase) in different chemical compositions of Al-Cu-Fe alloys. The ternary alloys with the nominal compositions of Al(70)Cu(20)Fe(10), Al(65)Cu(20)Fe(15) and Al(63)Cu(25)Fe(12) (at%) were rapidly solidified by melt-spinning technique. The melt-spun ribbons were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal analysis (DTA). According to the XRD results, diffraction patterns of Al(70)Cu(20)Fe(10) alloy showed the presence of the i-phase together with tetragonal theta-Al(2)Cu phase. However, XRD pattern of the melt-spun Al(63)Cu(25)Fe(12) alloy showed the formation of i-phase together with a small amount of beta-phase. The single quasicrystalline phase was observed only in the rapidly solidified Al(65)Cu(20)Fe(15) alloy. The SEM examinations showed that the melt-spun Al(70)Cu(20)Fe(10) and Al(63)Cu(25)Fe(12) alloys composed of i-phase with an average grain size of 1- mu m. However, for the Al(65)Cu(20)Fe(15) alloy, the quasicrystalline particles in the star-shape dendritic formations were observed. The melting point of i-phase was determined as 890 degrees C by DTA examinations.

  • Kapsamı

    Uluslararası

  • Type

    Hakemli

  • Index info

    WOS.SCI

  • Language

    English

  • Article Type

    None