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A recent structural model [1] for the F-type icosahedral phases i-AlPdMn and i-AlCuFe based on the KG cell decomposition [2] of the Mackay clusters has shown that they both enter in an unique model of general composition Al61.8(Pd Ι Cu)21.35(Mn Ι Fe)8.29(Al Ι Fe Ι Mn)4.28(Al Ι Cu)4.28 where (X Ι Y) means X or Y species. Three new alloys satisfying this composition rule, two ternaries Al66.08Cu21.35Mn12.57 and Al70.36Pd21.35Fe8.29 and one quaternary Al66.08Cu21.35Mn8.29Fe4.28 have been prepared by rapid quenching and annealing and studied by X-ray diffraction and electron microscopy. All three phases are quasicrystalline after quench: Al66.08Cu21.35Mn12.57 is decagonal, and the two others are F-icosahedral phases. After annealing, the quaternary alloy transforms into a decagonal phase. The present results are compared to those of previous studies in the litterature of samples with close compositions.
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Beauchesne et al. (2009) studied this question.
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