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Elevated Temperature Fatigue Crack Propagation of a Zr-Ti-Cu-Ni-Be Bulk Metallic Glass

Published online by Cambridge University Press:  11 February 2011

Peter A. Hess  and
Reinhold H. Dauskardt
Peter A. Hess
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305
Reinhold H. Dauskardt
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305
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Abstract

The sub-Tg elevated temperature fatigue propagation behavior of a Zr-based bulk metallic glass was examined. Fatigue crack-growth rates as a function of the applied stress intensity range, ΔK, are reported. Increased testing temperature was found to increase ΔKTH. Examination of crack surfaces at near-threshold growth rates revealed the presence of elongated ridges perpendicular to the crack front at higher temperatures; these ridges were absent in specimens tested at lower temperatures. The size of the features was found to increase with temperature and applied ΔK, finally breaking up at higher growth rates. Mechanisms responsible for the ridge formation are described, and modeled in terms of fluid meniscus instabilities that occur at the fatigue crack tip.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC9.10
Copyright
Copyright © Materials Research Society 2003

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References

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