Abstract
Structural studies of conventionally solidified Al80-2xPd20CrxFex alloys have shown that the formation of a well ordered icosahedral phase occurs for a composition where the free-electron Fermi sphere is coincident with the first pseudo-Brillouin zone boundary. This condition indicates the importance of the Hume-Rothery stabilization criterion for icosahedral phase formation in this system. Mossbauer effect studies show the similarity of the local structural order in stable Al72Pd20Cr4Fe4 to that found in stable quasicrystalline Al-Cu-Fe alloys and indicate a higher degree of structural order compared with that found in metastable icosahedral alloys prepared by non-equilibrium processing techniques.
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