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Effect of Loading Rate on Failure in Bulk Metallic Glasses

Published online by Cambridge University Press:  11 February 2011

T. Jiao ,
C. Fan ,
L.J. Kecskes ,
T.C. Hufnagel  and
K.T. Ramesh
T. Jiao
Affiliation:
Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
C. Fan
Affiliation:
Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
L.J. Kecskes
Affiliation:
U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005–5069, USA
T.C. Hufnagel
Affiliation:
Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
K.T. Ramesh
Affiliation:
Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
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Abstract

We have investigated failure in bulk metallic glass-forming alloys under dynamic compression. We implemented a recovery technique for the compression Kolsky bar to obtain dynamically deformed, intact specimens at various stages of deformation; this allows us to characterize the development of failure. We have also used high-speed photography to examine the failure process during the recovery experiments. The experimental results indicate that the failure under dynamic loading is somewhat different from that under quasi-static loading. Specimens subjected to quasistatic deformation developed multiple shear bands and substantial plastic deformations, while specimens subjected to dynamic (—strain rate ∼103 s-1) compressive loading fail by fracture along one dominant shear band. The mechanisms of dynamic failure in bulk metallic glasses are discussed on the basis of these experimental results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC6.2
Copyright
Copyright © Materials Research Society 2003

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References

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