As-cast quasicrystalline phase in a Zr-based multicomponent bulk alloy

Ku¨hn, U.; Eckert, J.; Mattern, N.; Mattern, M.; Schultz, L.
November 2000
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
Academic Journal
An icosahedral quasicrystalline phase is obtained directly from the melt by copper mold casting of a Zr[sub 57]Ti[sub 8]Nb[sub 2.5]Cu[sub 13.9]Ni[sub 11.1]Al[sub 7.5] alloy. On the other hand, rapid quenching of the alloy leads to an amorphous phase. Upon annealing, the amorphous structure precipitates quasicrystals in the first stage of crystallization. The microstructure of the quasicrystalline state is quite different for the two preparation routes, which is correlated with the asymmetry of the nucleation and growth rate upon cooling or heating. The quasicrystals formed upon slow cooling from the melt have a size of about 1 μm. In contrast, the quasicrystals formed by annealing do not exceed a size of 5-10 nm. © 2000 American Institute of Physics.


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