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Correlation between fracture surface morphology and toughness in Zr-based bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

Jin-Yoo Suh ,
R. Dale Conner ,
C. Paul Kim ,
Marios D. Demetriou  and
William L. Johnson
Jin-Yoo Suh
Affiliation:
W.M. Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125; and Korea Institute of Science & Technology, Seoul 136-791, Republic of Korea
R. Dale Conner*
Affiliation:
California State University Northridge, Northridge, California 91330
C. Paul Kim
Affiliation:
W.M. Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125; and Liquidmetal Technologies, Rancho Santa Margarita, California 92688
William L. Johnson
Affiliation:
W.M. Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125
*
a)Address all correspondence to this author. e-mail: rdconner@csun.edu
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Abstract

Fracture surfaces of Zr-based bulk metallic glasses of various compositions tested in the as-cast and annealed conditions were analyzed using scanning electron microscopy. The tougher samples have shown highly jagged patterns at the beginning stage of crack propagation, and the length and roughness of this jagged pattern correlate well with the measured fracture toughness values. These jagged patterns, the main source of energy dissipation in the sample, are attributed to the formation of shear bands inside the sample. This observation provides strong evidence of significant “plastic zone” screening at the crack tip.

Keywords

AmorphousFractureToughness
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 5 , May 2010 , pp. 982 - 990
Copyright
Copyright © Materials Research Society 2010

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