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Variation of Hardness and Modulus across the Thickness of Zr-Cu-Al Metallic Glass Ribbons

Published online by Cambridge University Press:  09 January 2013

Z. Humberto Melgarejo
Affiliation:
Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, U.S.A.
J.E. Jakes
Affiliation:
Performance Enhanced Biopolymers, United States Forest Service, Forest Products Laboratory, Madison, WI 53726, U.S.A.
J. Hwang
Affiliation:
Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, U.S.A.
Y.E. Kalay
Affiliation:
Ames Laboratory (DOE), Ames, Iowa 50011, USA and Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, U.S.A.
M.J. Kramer
Affiliation:
Ames Laboratory (DOE), Ames, Iowa 50011, USA and Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, U.S.A.
P.M. Voyles
Affiliation:
Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, U.S.A. Department of Materials Science and Engineering, and Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, U.S.A.
D.S. Stone
Affiliation:
Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, U.S.A. Department of Materials Science and Engineering, and Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, U.S.A.
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Abstract

We investigate through-thickness hardness and modulus of Zr50Cu45Al5 metallic glass melt-spun ribbon. Because of their thinness, the ribbons are challenging to measure, so we employ a novel nanoindentation based-method to remove artifacts caused by ribbon flexing and edge effects. Hardness and modulus vary approximately linearly across the thickness but, unlike bulk ingots, the side of the ribbon that cooled most quickly had the highest hardness and modulus. This “inverse” variation may be caused by the fast-moving solidification front, which might conceivably, for instance, push free volume in advance of it. Annealing near Tg causes both hardness and modulus to increase and become more uniform across the thickness.

Type
Articles
Copyright
Copyright © Materials Research Society 2012

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References

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