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Micrometer-sized quasicrystals in the Al85Ni5Y6Co2Fe2 metallic glass: A TEM study and a brief discussion on the formability of quasicrystals in bulk and marginal glass-forming alloys

Published online by Cambridge University Press:  16 May 2012

M. Yan*
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Centre for Advanced Materials Processing and Manufacturing, Brisbane, QLD 4072, Australia
J.Q. Wang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
C. Kong
Affiliation:
Electron Microscopy Unit, University of New South Wales, Sydney, NSW 2052, Australia
G.B. Schaffer
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Centre for Advanced Materials Processing and Manufacturing, Brisbane, QLD 4072, Australia
M. Qian*
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Centre for Advanced Materials Processing and Manufacturing, Brisbane, QLD 4072, Australia
*
a)Address all correspondence to these authors. e-mail: m.yan2@uq.edu.au
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Abstract

Large quasicrystals up to ∼10 μm in size with a volume fraction of ∼30% have been identified in a nitrogen gas-atomized marginal glass-forming alloy Al85Ni5Y6Co2Fe2 by detailed transmission electron microscopy. The formation of the large quasicrystal (Q) phase is discussed through the configuration of the valence electrons of its constituent elements, and the thermodynamic and kinetic factors associated with the solidification of this marginal glass-forming alloy during gas atomization. The finding leads to an important inference that marginal glass-forming alloys could be ideal systems for the formation of bulk quasicrystals under appropriate kinetic conditions. The Q phase is stable up to ∼500 °C and decomposes thereafter. The activation energy for the decomposition of the Q phase is similar to the self-diffusion of Al. Two new intermetallic phases associated with the formation and decomposition of the Q phase have also been identified and characterized.

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Articles
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Copyright © Materials Research Society 2012

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References

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