A comparative study of the Al-Co-Pd and Al-Co-Ni alloy systems

The Al-Pd-Co and Al-Ni-Co alloy systems are compared with respect to the formation of quasicrystals. Their structures, as expected, have some similarities due to the similarities of Ni and Pd, which belong to the same column of the Periodic Table. However, a metastable binary Al-Co decagonal quasicrystal is stabilized by Ni and not stabilized by Pd. A number of periodic phases are formed in Al-Pd-Co in the compositional range corresponding to the decagonal phase in Al-Ni-Co. Similar orthorhombic decagonal-like structures are formed in both systems with the same compositions as the (meta) stable quasicrystals at lower temperatures. (C) 2003 Elsevier B.V. All rights reserved