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

Suh, Jin-Yoo and Conner, R. Dale and Kim, C. Paul and Demetriou, Marios D. and Johnson, William L. (2010) Correlation between fracture surface morphology and toughness in Zr-based bulk metallic glasses. Journal of Materials Research, 25 (5). pp. 982-990. ISSN 0884-2914.

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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.

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Additional Information:© 2010 Materials Research Society. Received 30 September 2009; accepted 14 January 2010. The authors would like to thank Prof. G. Ravichandran of GALCIT, Caltech for providing the MTS test system. This work was supported in part by the MRSEC Program of the National Science Foundation under Award No. DMR-0520565.
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Issue or Number:5
Record Number:CaltechAUTHORS:20100526-111224370
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18455
Deposited By: Tony Diaz
Deposited On:20 Jun 2010 19:37
Last Modified:03 Oct 2019 01:42

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