The splat-quenched Ni50Zr50 alloy has a rosette-shaped phase with tenf
old symmetry. The structure of this phase has been interpreted (Yang,
1985) as ''tenfold twins'' of the orthorhombic NiZr phase. The formati
on and the feature of the phase with tenfold symmetry have been invest
igated in Ni50Zr50, Ni50-xCuxZr50 and Ni50-xCoxZr50 amorphous alloys.
It was found that this phase forms first during the crystallization pr
ocess. The structure comes nearer to the structure of a quasi-crystal
through the influence of Cu and Co atoms.