New Decagonal Al–Ni–Fe and Al–Ni–Co Alloys Prepared by Liquid Quenching

New decagonal alloys in the Al–Ni–Fe and Al–Ni–Co systems have been produced by liquid quenching. Their formations extend in the ranges of 9 to 16 at% Ni and 9 to 21 at% Fe or Co. The whole replacement of Fe or Co in Al₇₅Ni₁₀(Fe or Co)₁₅ alloys by V, Cr, Mn or Ru gives a mixed structure consisting of decagonal, icosahedral and crystalline phases. The decagonal phase consists of large grains with a size above 1 μm and the magnitude of the phason strain frozen during liquid quenching is relatively small probably because of the two-dimensional quasicrystalline structure.