Icosahedral quasicrystals of Al-Cu-Li are formed by solid-state reaction at the grain boundaries of host alloy. Convergent-beam electron-diffraction measurements confirm that the symmetries of the quasicrystals belong to the m3̄5̄ point group. The icosahedral grains are formed by a nucleation and growth process and are strongly oriented at the grain-matrix interface. The stability of the icosahedral phase is compared with that of metallic glasses produced by a similar technique.
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Cassada et al. (1986) studied this question.
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