Phase relations between the liquid and the solid icosahedral (I-) phases were examined at different temperatures to determine the growth condition of a single Al-Cu-Fe I-quasicrystal using the Czochralski method. The composition of the single I-quasicrystal was chosen to be Al64Cu23Fe13 due to the superior thermal stability. We found that the liquid composition, with equilibrates to the Al64Cu23Fe13 I-phase at 1073 K, was Al57.7Cu37.7Fe3.5Si1.1. Based on the phase relation, production of a single Al64Cu23Fe13 I-quasicrystal was attempted by using the Czochralski method. As a result, we succeeded in the growth of a single Al64Cu23Fe13 I-quasicrystal, and we also measured the Vickers hardness of annealed single I-quasicrystal samples with different anneal times to estimate the structural improvement by annealing.
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