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The Thermal Stability of a Single-Grain Mg-Zn-Y Icosahedral Quasicrystal

Published online by Cambridge University Press:  17 March 2011

Z.P. Luo ,
Y.L. Tang ,
D.J. Miller ,
M.J. Kramer ,
I.R. Fisher  and
P.C. Canfield
Z.P. Luo
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A
Y.L. Tang
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A Ames Laboratory, Iowa State University, Ames, IA 50011, U.S.A
D.J. Miller
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A
M.J. Kramer
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011, U.S.A
I.R. Fisher
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011, U.S.A
P.C. Canfield
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011, U.S.A
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Abstract

The stability of the Mg-Zn-Y icosahedral quasicrystal (IQC) has been studied by long-term annealing of a single grain IQC in quartz tubes. Decomposition of the IQC was observed after annealing at high temperatures (T≥773 K) sealed in Ar. During the decomposition process, the quasilattice parameter aR was found to decrease, associated with a decrease in Mg content of the IQC phase as confirmed by quantitative x-ray energy dispersive spectroscopy analyses. In addition, a new cubic approximant has been found in the annealed samples. This cubic approximant has a face-centered cubic (fcc) structure with lattice parameter of a = 1.276 nm, which is about (1/τ) times smaller than that of the fcc W'-(MgZnY) with a = 2.05 nm reported previously (where τ is the golden ratio).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K9.4
Copyright
Copyright © Materials Research Society 2001

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