Atomic structures of as-quenched and as-cast Al 65 Cu 15 Co 20 decagonal alloys have been studied by the anomalous X-ray scattering (AXS) method. It is found that basic structural features in the as-quenched alloy are identical to those of the as-cast alloy, although the peaks are slightly sharper in the as-cast alloy. From the differential interference functions, it would be expected that Co atoms are homogeneously distributed in the decagonal phase but Cu atoms are not. Such difference in the atomic sites for Co and Cu has also been observed in the environmental pair distribution functions (PDFs) for Co and Cu. This is contrast to the environmental structures around Fe and Ni in the Al 75 Fe 15 Ni 10 decagonal alloy. Furthermore, it appears that the local atomic structure in the Al 65 Cu 15 Co 20 decagonal alloy might be similar to that in the Al 13 Fe 4 crystalline compound.
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