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MICROFRACTURE BEHAVIOR OF METALLIC-CONTINUOUS-FIBER-REINFORCED AMORPHOUS MATRIX COMPOSITES FABRICATED BY LIQUID PRESSING PROCESS SCIE SCOPUS KCI

Title
MICROFRACTURE BEHAVIOR OF METALLIC-CONTINUOUS-FIBER-REINFORCED AMORPHOUS MATRIX COMPOSITES FABRICATED BY LIQUID PRESSING PROCESS
Authors
Lee, KLee, SBLee, SKLee, S
Date Issued
2008-08
Publisher
KOREAN INST METALS MATERIALS
Abstract
Zr-based amorphous alloy matrix composites reinforced with metallic continuous fibers were fabricated by liquid pressing process, and their fracture properties were investigated by directly observing microfracture process using an in situ loading stage installed inside a scanning electron microscope chamber. About 60 vol.% of metallic fibers were homogeneously distributed inside the amorphous matrix. Apparent fracture toughness of the stainless-steel- and tungsten-fiber-reinforced composites was lower than that of monolithic amorphous alloy, while that of the Ta-fiber-reinforced composite was higher. According to the microfracture observation, shear bands or cracks were initiated at the amorphous matrix, and the propagation of the initiated shear bands or cracks was effectively blocked by fibers, 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 fiber-reinforced composites, and could be explained by mechanisms of formation Of multiple shear bands or multiple cracks at the amorphous matrix and blocking of crack or shear band propagation and multiple necking at metallic fibers.
Keywords
amorphous alloy; composite; liquid pressing process; fracture toughness; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; GLASS COMPOSITES; ALLOY; TUNGSTEN; MICROSTRUCTURE; TEMPERATURES; DEFORMATION
URI
https://oasis.postech.ac.kr/handle/2014.oak/28627
ISSN
1738-8228
Article Type
Article
Citation
JOURNAL OF THE KOREAN INSTITUTE OF METALS AND MATERIALS, vol. 46, no. 8, page. 524 - 537, 2008-08
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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