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Published May 2010 | Published
Journal Article Open

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


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.

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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