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In situ fracture observation and fracture toughness analysis of Zr-based bulk amorphous alloys

Title
In situ fracture observation and fracture toughness analysis of Zr-based bulk amorphous alloys
Authors
Lee, JGSohn, KSLee, SKim, NJKim, CP
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2007
Publisher
ELSEVIER SCIENCE SA
Abstract
The fracture property improvement of Zr-based bulk amorphous alloy containing ductile crystalline particles was explained by directly observing microfracture processes using an in situ loading stage installed inside a scanning electron microscope (SEM) chamber. Strength and apparent fracture toughness measured from the in situ fracture test of the amorphous alloy containing crystalline particles were lower than those of the monolithic amorphous alloy, whereas its ductility was higher. According to the microfracture observation, shear bands were initiated from ductile crystalline particles, and the propagation of the shear bands or cracks was blocked by crystalline particles, thereby resulting in stable crack growth which could be confirmed by the fracture resistance curve (R-curve) behavior. This increase in fracture resistance with increasing crack length improved fracture properties of the alloy containing crystalline particles, and could be explained by mechanisms of blocking of crack or shear band propagation, formation of multiple shear bands, crack blunting, and shear band branching. (c) 2007 Elsevier B.V. All rights reserved.
Keywords
bulk amorphous alloy; ductile crystalline particle; fracture toughness; shear band; R-curve analysis; AISI 4340 STEEL; METALLIC-GLASS; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; CRACK-PROPAGATION; COMPOSITES; PHASE; MICROSTRUCTURE; PLASTICITY; BOUNDARIES
URI
http://oasis.postech.ac.kr/handle/2014.oak/29496
DOI
10.1016/J.MSEA.2007.
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 464, no. 39815, page. 261 - 268, 2007-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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