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Structural Relationships between QC and Meta-stable Crystalline Phases in Melt Spun Zr80Pt20 Ribbons

Published online by Cambridge University Press:  01 February 2011

X. Y. Yang ,
M. J. Kramer ,
E. A. Rozhkova  and
D. J. Sordelet
X. Y. Yang
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
M. J. Kramer
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
E. A. Rozhkova
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
D. J. Sordelet
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
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Abstract

Two competing meta-stable crystalline phases, a bcc hyperstoichiometric β-Zr(Pt) (Im3m) superstructure and a non-stoichiometric fcc ε-Zr6Pt3O (Fd3m) phase, have been observed to coexist with a quasicrystalline (i) phase, respectively, in as-spun Zr80Pt20 ribbons with low oxygen content (184ppm mass O) and high oxygen content (4737 ppm mass O). Transmission electron microscopy (TEM) results show that the β-Zr(Pt) superstructure and i phase have a well defined orientational relationship, good crystallographic match and nearly identical stoichiometry. Icosahedral two-fold axes coincide with <110>, <111>, <112> and <113> axes in β-Zr(Pt); {110}β-Zr planes register with icosahedral {211111} fivefold or {221001} twofold planes. The observed orientational relationship and the space group (Im3m) preclude β-Zr(Pt) as a cubic approximant to the i phase. Both β-Zr(Pt) and the i phase are distorted; β-Zr(Pt) maintains a basic β-Zr Bravais lattice with an aperiodic superlattice. Morphologies suggest that the i phase forms first, followed by an easy nucleation of the β-Zr(Pt) on the surfaces of the i phase. Also, a similar orientational relationship and lattice match between ε-Zr6Pt3O and i phase has been revealed by TEM.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 805: Symposium LL – Quasicrystals , 2003 , LL7.8
Copyright
Copyright © Materials Research Society 2004

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References

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