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

Title
Correlation between fracture surface morphology and toughness in Zr-based bulk metallic glasses
Authors
서진유R. Dale ConnerC. Paul KimMarios D. DemetriousWilliam L. Johnson
Keywords
amorphous metal; metallic glass; fracture; fracture surface; shear band
Issue Date
2010-05
Publisher
Journal of materials research
Citation
VOL 25, NO 5, 982-990
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.
URI
http://pubs.kist.re.kr/handle/201004/37618
ISSN
0884-2914
Appears in Collections:
KIST Publication > Article
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