Solidification character of Al ₇₂Ni ₁₂Co ₁₆ single-decagonal quasicrystal alloy

The rotation symmetry, microstructure and solidification character of Al ₇₂Ni ₁₂Co ₁₆ quasicrystal alloy were studied by the conventional casting method and SEM, XRD, DTA and TEM analysis. The results indicate that under the conventional casting condition, the Al ₇₂Ni ₁₂Co ₁₆ alloy exhibits a single and porosity microstructure. During the solidification, the quasicrystal phase precipitates directly from the liquid. The Al ₇₂Ni ₁₂Co ₁₆ decagonal quasicrystal phase is a nearly congruent compound where the liquidus and peritectic-reaction lines are very close.