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Quasicrystal Formation in a Zr-based Bulk Metallic Glass

Published online by Cambridge University Press:  01 February 2011

L. Liu ,
K. C. Chan  and
G. K. H. Pang
L. Liu
Affiliation:
Department of Industrial & Systems Engineering, The Hong Kong Polytechnic University, Hong Kong The State Key Lab of Die & Mould Technology, Huazhong University of Science and Technology, China
K. C. Chan
Affiliation:
Department of Industrial & Systems Engineering, The Hong Kong Polytechnic University, Hong Kong
G. K. H. Pang
Affiliation:
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong
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Abstract

Zr65Ni10Cu7.5Al7.5Ag10 bulk metallic glass with a diameter of 2 mm and a length of 50 mm was prepared by copper-mould casting. The metallic glass obtained follows two-step crystallization reactions with the initial formation of metastable quasicrystals from amorphous phase, followed by the formation of a stable intermetallic Zr2Cu from the post-formed quasicrystals. In this paper, the microprocess of the amorphous-to-quasicrystalline transformation of Zr65Ni10Cu7.5Al7.5Ag10 bulk metallic glass was studied in detail by TEM and high resolution TEM coupled with nanobeam EDX. It was found that the amorphous-to-quasicrystalline transformation in the present system does not follow the traditional nucleation/growth mechanism. Instead, it undergoes a series of inter-processes and follows the sequence of phase transformation of amorphous → FCC Zr2Ni → Tetragonal Zr2Ni → Quasicrystals. Nanobeam EDX revealed that atomic diffusion was involved in all inter-processes of the phase transformations, suggesting that the amorphous-to-quasicrystalline transformation in the present bulk metallic glass is a non-polymorphous reaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 805: Symposium LL – Quasicrystals , 2003 , LL6.8/MM4.8
Copyright
Copyright © Materials Research Society 2004

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References

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