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Dynamic tensile deformation behavior of Zr-based amorphous alloy matrix composites reinforced with tungsten or tantalum fibers

Title
Dynamic tensile deformation behavior of Zr-based amorphous alloy matrix composites reinforced with tungsten or tantalum fibers
Authors
Hyungsoo LeeGyeong Su KimChangwoo JeonSeok Su SohnSang-Bok LeeSang-Kwan LeeKim, HSLee, S
POSTECH Authors
Kim, HSLee, S
Date Issued
Jul-2016
Publisher
Springer
Abstract
Zr-based amorphous alloy matrix composites reinforced with tungsten (W) or tantalum (Ta) continuous fibers were fabricated by liquid pressing process. Their dynamic tensile properties were investigated in relation with microstructures and deformation mechanisms by using a split Hopkinson tension bar. The dynamic tensile test results indicated that the maximum strength of the W-fiber-reinforced composite (757 MPa) was much lower than the quasi-statically measured strength, whereas the Ta-fiber-reinforced composite showed very high maximum strength (2129 MPa). In the W-fiber-reinforced composite, the fracture abruptly occurred in perpendicular to the tensile direction because W fibers did not play a role in blocking cracks propagated from the amorphous matrix, thereby resulting in abrupt fracture within elastic range and consequent low tensile strength. The very high dynamic tensile strength of the Ta-fiber-reinforced composite could be explained by the presence of ductile Ta fibers in terms of mechanisms such as (1) interrupted propagation of cracks initiated in the amorphous matrix, (2) formation of lots of cracks in the amorphous matrix, and (3) sharing of loads and severe deformation (necking) of Ta fibers in cracked regions.
URI
http://oasis.postech.ac.kr/handle/2014.oak/37245
DOI
10.1007/S12540-016-5472-4
ISSN
1598-9623
Article Type
Article
Citation
Metals and Materials International, vol. 22, no. 4, page. 707 - 713, 2016-07
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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