Direct observation of icosahedral cluster in Zr[sub 70]Pd[sub 30] binary glassy alloy

Saida, Junji; Matsushita, Mitsuhide; Inoue, Akihisa
July 2001
Applied Physics Letters;7/16/2001, Vol. 79 Issue 3
Academic Journal
The medium-range order in the Zr[sub 70]Pd[sub 30] binary glassy alloy, where the nanoicosahedral phase precipitates as a primary phase, was examined using the high-resolution electron microscopic technique. The ordered region in the diameter of ∼2 nm was observed in the as-quenched glassy state. This region grows slightly to the diameter of 3–4 nm by annealing for 120 s at 690 K, where the amorphous structure remains. The nanobeam electron diffraction pattern taken from the medium-range order shows the fivefold symmetry, indicating that this region has the icosahedral structure. This result is recognized as a direct evidence for the existence of the icosahedral cluster in the alloy. For further annealing for 600 s at 690 K, the icosahedral quasicrystalline phase in the diameter of 5–8 nm precipitates by assimilating the icosahedral cluster. The formation of the nanoicosahedral phase originates from the existence of the quenched-in icosahedral clusters in the glassy state followed by their easy growth to the icosahedral particle without significant rearrangement of the constitutional elements. © 2001 American Institute of Physics.


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