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Effects of crystalline particles on mechanical properties of strip-cast Zr-base bulk amorphous alloy

Title
Effects of crystalline particles on mechanical properties of strip-cast Zr-base bulk amorphous alloy
Authors
Lee, JGLee, DGLee, SCho, KMPark, IKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
ELSEVIER SCIENCE SA
Abstract
Effects of crystalline phase particles formed in a strip-cast Zr-base bulk amorphous alloy on strength, ductility, and fracture toughness were investigated by directly observing microfracture processes using an in situ loading stage installed inside a scanning electron microscope chamber. The compressive and fracture toughness test results indicated that strength, ductility, and fracture toughness of the strip-cast amorphous alloy were higher than those of the as-cast monolithic amorphous alloy, although the strip-cast alloy contained a considerable amount (4.5 vol.%) of hard, brittle crystalline particles. According to the in situ microfracture observation, crystalline particles were easily cracked under low stress levels, acted as blocking sites of shear band or crack propagation, and provided initiation sites of multiple shear bands. Thus, the improvement of mechanical properties in the strip-cast alloy could be explained by mechanisms of (1) blocking of crack propagation, (2) formation of multiple shear bands, and (3) crack deflection by crystalline particles. (C) 2004 Elsevier B.V. All rights reserved.
Keywords
bulk amorphous alloy; strip casting; crystalline particle; multiple shear band; crack deflection; METALLIC-GLASS; SUPERCOOLED LIQUID; FRACTURE-TOUGHNESS; DEFORMATION-BEHAVIOR; COMPOSITES; PHASE; MICROSTRUCTURE
URI
http://oasis.postech.ac.kr/handle/2014.oak/29688
DOI
10.1016/J.MSEA.2004.
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 390, no. 1-2, page. 427 - 436, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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