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자료유형
학술저널
저자정보
Hyungsoo Lee (Pohang University of Science and Technology) Gyeong Su Kim (Hyundai Heavy Industries) 전창우 (포항공과대학교) Seok Su Sohn (Pohang University of Science and Technology) Sang-Bok Lee (Korea Institute of Materials Science) Sang-Kwan Lee (Korea Institute of Materials Science) Hyoung Seop Kim (Pohang University of Science and Technology) Sunghak Lee (Pohang University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.4
발행연도
2016.1
수록면
707 - 713 (7page)

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초록· 키워드

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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.

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