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Stereophotogrammetric Investigation of Overload and Cyclic Fatigue Fracture Surface Morphologies in a Zr–Ti–Ni–Cu–Be Bulk Metallic Glass

Published online by Cambridge University Press:  31 January 2011

A. Tatschl ,
C. J. Gilbert ,
V. Schroeder ,
R. Pippan  and
R. O. Ritchie
A. Tatschl
Affiliation:
Austrian Academy of Sciences, Erich-Schmid-Institut für Materialwissenschaft, Leoben, Austria
C. J. Gilbert
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720–1760
V. Schroeder
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720–1760
R. Pippan
Affiliation:
Austrian Academy of Sciences, Erich-Schmid-Institut für Materialwissenschaft, Leoben, Austria
R. O. Ritchie
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720–1760
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Abstract

Fracture surfaces of a recently developed Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 (at.%) bulk metallic glass were investigated using a three-dimensional surface reconstruction technique. Stereoscopic scanning electron microscopy of both fatigue and overload fracture surfaces permitted the creation of digital elevation models that were used to quantify important fracture surface features. Characterization of the surfaces revealed striations of nearly constant spacing on fatigue surfaces and a vein morphology characteristic in amorphous metals on the overload fracture surfaces. Additionally, at the onset of critical failure, crack-tip openings of ˜16 μm were observed that were consistent with measured values of fracture toughness. Interestingly, at the onset of fracture, deformation was confined to one side of the fracture plane, possibly because of the asymmetric emission of shear bands from the crack tip, consistent with the highly inhomogeneous nature of deformation in this alloy.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 4 , April 2000 , pp. 898 - 903
Copyright
Copyright © Materials Research Society 2000

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