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The alloy with composition Al 70 Co 15 Ni 15  forms one of the important quasicrystalline phase exhibiting formation of decagonal variants [1, 2]. In the present investigation, copper has been substituted in place of cobalt i.e. the phases corresponding to Al 70 Co 15–   x  Cu  x  Ni 15 , have been investigated. It is found that when copper concentration reaches to a value of 10 atomic percent with the composition corresponding to Al 70 Co 5 Cu 10 Ni 15 , the decagonal phase starts yielding to give rise to vacancy ordered phase. When all cobalt is replaced by copper i.e. when the composition corresponds to Al 70 Cu 15 Ni 15 , the decagonal phase disappears and the only phase observed is the vacancy ordered phase. It can thus be said that copper substitution brings in decagonal to vacancy ordered (VOP) phase transition. It has also been observed that gradual increase in concentration of Cu in Al 70 Co 15–   x  Cu  x  Ni 15  leads to cellular to dendritic transition in morphology.

Investigation of transition from decagonal to vacancy ordered phase on replacement of Co by Cu in Al 70 Co 15– x Cu x Ni 15