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Environmental and Stress State Effects on Fracture and Fatigue Crack-Growth in Zr-Ti-Ni-Cu-Be Bulk Amorphous Metals

Published online by Cambridge University Press:  10 February 2011

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

Our work has focused on the fracture and fatigue crack-growth mechanisms of a Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass. These alloys exhibit failure strengths on the order of 2 GPa and toughnesses of 10–30 MPa√m with remarkably little plastic deformation. The effect of stress state on strength properties was studied in an effort to model fracture mechanisms. While fracture surfaces suggest significant plastic flow, failure strains are quite small and appear to be independent of stress state. Other methods of energy dissipation, including adiabatic heating, are discussed. Temperature increases of more than 20°C have been noted on the side face of the fracture sample at the crack tip during fracture. The micromechanics of fatigue crack growth are also considered and related to the batch chemistry, environment, and microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 355
Copyright
Copyright © Materials Research Society 1999

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