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Fracture and Fatigue Crack Growth of Bulk Metallic Glass Alloys and their Composites

Published online by Cambridge University Press:  17 March 2011

Katharine M. Flores  and
Reinhold H. Dauskardt
Katharine M. Flores
Affiliation:
Department of Materials Science and Engineering Stanford University Stanford, CA 94305-2205
Reinhold H. Dauskardt
Affiliation:
Department of Materials Science and Engineering Stanford University Stanford, CA 94305-2205
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Abstract

Bulk metallic glasses exhibit extraordinary strength and elastic properties, but the lack of extensive plastic deformation and the catastrophic nature of failure limit the usefulness of the monolithic alloy. This work presents an overview of the results of fracture and fatigue crack growth experiments for a bulk metallic glass matrix composite with a Zr-Ti-Nb reinforcement phase precipitated in situ. The composite exhibits stable crack growth at stress intensities nearly double the fracture toughness of the monolithic glass. This is associated with the formation of a distributed damage zone at the crack tip. While the second phase had a marked effect on the fracture behavior, there was very little change to the fatigue crack growth results. Fractography suggests that the second phase particles are too small to cause crack bridging or significantly change the crack path.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L9.5
Copyright
Copyright © Materials Research Society 2001

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