Abstract
The formation and thermal stability of a quasicrystal and its approximant have been investigated in the ternary AlCu(Fe,Ru) and AlPdMn systems. In the AlCuFe system, the rhombohedral approximant is observed with microcrystalline or a coarse-grained structure, depending on the annealing temperature. Also the intermediate state with τ ≈1.75 is observed in Al 62Cu 26Fe 12. In the AlCuRu system, the icosahedral phase is observed in two different compositional regions, which satisfy the condition e / a = 1.75. The 1/0 cubic approximant is found at the composition of Al 71Cu 7Ru 22. In the AlPdMn system, the icosahedral and decagonal phases as well as their approximants are observed.
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