Abstract
The formation of the icosahedral phase in an Al70Cu20Fe10 quasicrystal and the structural transition from the crystal praphase to the quasicrystalline phase are simulated and studied by means of X-ray absorption near edge structure spectroscopy. Al-Cu-Fe samples are fabricated by means of powder metallurgy. The ω phase of the praphase crystal forms following exposure at 500°C for 20 min; the quasicrystalline phase forms after exposure at 800°C for 2 h. The model of the structural transition from the crystal to quasicrystal is a diffusion displacement of aluminum atoms around iron atoms with the formation of an icosahedron with the iron atom at the center. The immediate environment of copper atoms consists mainly of aluminum and copper atoms, and no iron atoms are observed.
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