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The Effects of Annealing on Fatigue Behavior in Zr-based Bulk Metallic Glasses

Published online by Cambridge University Press:  20 May 2011

Peng Tong ,
Despina Louca ,
Yoshihiko Yokoyama ,
Anna Llobet ,
Gongyao Wang ,
Yunfeng Shi ,
Peter Liaw ,
Graham King  and
Rick Spence
Peng Tong
Affiliation:
Department of Physics, University of Virginia, Charlottesville, VA 22904, U.S.A.
Despina Louca
Affiliation:
Department of Physics, University of Virginia, Charlottesville, VA 22904, U.S.A.
Yoshihiko Yokoyama
Affiliation:
Tohoku University, Sendai 980-8577, Japan.
Anna Llobet
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Gongyao Wang
Affiliation:
The University of Tennessee, Knoxville, TN 37831-6376, U.S.A.
Yunfeng Shi
Affiliation:
Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A.
Peter Liaw
Affiliation:
The University of Tennessee, Knoxville, TN 37831-6376, U.S.A.
Graham King
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Rick Spence
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, U.S.A.
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Abstract

The effects of annealing and fatigue on the local structure of Zr50Cu40Al10 and Zr60Cu30Al10 bulk metallic glasses (BMG) were investigated using the pair density function (PDF) analysis of synchrotron X-ray and neutron diffraction data. Our results indicate that the two compositions respond differently to annealing. The first PDF peak becomes sharper after annealing in Zr50Cu40Al10 with its intensity increasing, indicating that short-range ordering may be induced after the heat treatment. On the other hand, in Zr60Cu30Al10, the effects due to the heat treatment on the local structure are more subtle. Separately, the as-quenched and annealed alloys with the composition Zr50Cu40Al10 were subjected to fatigue loading conditions with ~ 106 compression cycles. The room temperature measurements showed changes in the local structure with fatigue especially for the annealed sample, involving the Cu-Zr correlations. Our results suggest that the physical properties of BMGs upon fatigue loading conditions may become accentuated due to the structural relaxation brought upon by annealing, leading to observable structural changes at the atomic level from fatigue.

Keywords

annealingamorphousneutron scattering
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1300: Symposium U – Bulk Metallic Glasses and their Applications , 2011 , mrsf10-1300-u09-36
Copyright
Copyright © Materials Research Society 2011

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