Preparation and characterisation of melt-spun Al–Cu–Fe quasicrystals

Structure and Mechanical Properties of Al-Cu-Fe-X Alloys with Excellent Thermal Stability

“…No voids were present and no quasicrystalline phases were found in these cast alloys. This fact is very surprising because stable quasicrystalline phase was always obtained by casting process [ 4 , 28 ]. Voids are always present and they are usually distributed around CuAl 2 particles and α-Fe dentrites [ 29 ].…”

“…Al 65 Cu 20 Fe 15 phase has icosahedral symmetry (i-phase) and forms by a peritectic reaction as ß + λ-Al 13 Fe 4 + l → i-phase [ 30 ]. After formation of Al 65 Cu 20 Fe 15 phase, Al 13 Fe 4 and CuAl 2 phases formed at the later stages of cooling [ 4 ]. Al 84.6 Cr 15.4 phase (card number 00-048-1564, unknown), which is also quasicrystalline, and Al 95 Fe 4 Cr phase (card number 00-045-1017, unknown) originated during melt spinning process in alloy with chromium.…”

“…Copper is used to increase strength and hardness, which are influenced mainly by precipitation of CuAl 2 phase during the heat treatment. This phase has tetragonal structure and forms also during rapid solidification [ 4 ].…”

Characterization of Rapidly Solidified Al65Cu20Fe15Alloy in Form of Powder or Ribbon

“…A broader area for quasicrystalline structure can be formed in rapidly solidied alloys and indeed single I-phase structure was observed in the rapidly solidied Al 65 Cu 20 Fe 15 ribbon [8,9]. However, for the same composition the single quasicrystalline phase cannot be obtained by using the cooling rate 57 × 10 4 deg/s and the ribbons exhibit two-or three-phase microstructure [7,10]. In the case of ribbons quasicrystals solidied directly from the melt as primary phase and crystalline phases formed at the inter-dendritic region from the remaining melt [7].…”

Characterization of the icosahedral quasicrystalline phase in rapidly solidified Al–Cu–Fe alloys

“…Since then, a number of quasicrystals have been found in several binary, ternary and multicomponent alloy systems and characterized mainly by XRD. Among them, the formation of icosahedral quasicrystalline phase (i-phase) in ternary Al--Cu--Fe alloy prepared by rapid quenching, conventional solidification or mechanical alloying process has been investigated in detail by many researchers [2][3][4][5][6][7]. Quasicrystals exhibit interesting physical, mechanical and chemical properties which are quite different to the properties of the conventional crystalline state.…”