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.
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