Abstract
The formation condition and the stability of the Cu–Ga–Mg–Sc icosahedral quasicrystal have been investigated in terms of the effects of Mg concentration and long time annealing. An addition of a few percent of Mg to the Cu 3.7Ga 2.3Sc-type cubic approximant causes the formation of an icosahedral quasicrystal. This quasicrystal is formed near the alloy composition of Cu 48Ga 34Mg 3Sc 15, and is regarded as a thermodynamically stable phase since the amount of the icosahedral quasicrystal in the alloy increased by annealing at 770 °C. The structural quality of the quasicrystal was also improved by this annealing, and this improvement is related to the elimination or the reduction of quenched-in phason strains.
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