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Medium-range Order of Zr54Cu38Al8 Bulk Metallic Glass

Published online by Cambridge University Press:  22 January 2014

Pei Zhang ,
M. F. Besser ,
M. J. Kramer  and
P. M. Voyles
Pei Zhang
Affiliation:
Materials Science and Engineering, University of Wisconsin, Madison, Madison, WI 53711
M. F. Besser
Affiliation:
Ames Laboratory, Ames, IA 50011
M. J. Kramer
Affiliation:
Ames Laboratory, Ames, IA 50011
P. M. Voyles
Affiliation:
Materials Science and Engineering, University of Wisconsin, Madison, Madison, WI 53711
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Abstract

We have previously reported, based on fluctuation electron microscopy (FEM) data, that Zr50Cu45Al5 bulk metallic glass (BMG) contains significant icosahedral and crystal-like medium-range order. Here, we report similar finding for Zr54Cu38Al8 BMG, which is a poorer glass former. Like Zr50Cu45Al5, Zr54Cu38Al8 contains icosahedral and crystal-like structures. In the as-cast state, the crystal-like peak in the FEM data is stronger than icosahedral-like peak. After annealing at 0.83Tg (573 K), the icosahedral-like peak increases, but, unlike Zr50Cu45Al5, the crystal-like peak does not decrease. This tendency toward stronger, more thermally stable crystal-like order may be associated with the poorer glass forming ability of Zr54Cu38Al8.

Keywords

scanning transmission electron microscopy (STEM)amorphousnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1649: Symposium II – Bulk Metallic Glasses , 2014 , mrsf13-1649-ii08-09
Copyright
Copyright © Materials Research Society 2014 

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