액상가압공정으로 제조된 탄탈륨 연속섬유 강화 Zr계 비정질 복합재료의 기계적 성질의 이방성 (Anisotropic Mechanical Properties of Tantalum-Continuous-Fiber-Reinforced Zr-based Amorphous Matrix Composites Fabricated by Liquid Pressing Process)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 47권 / 9호 / 542 ~ 549페이지
· 저자명 : 이규홍, 이상복, 이상관, 이성학

초록

Zr-based amorphous alloy matrix composites reinforced with tantalum continuous fibers were
fabricated by the liquid pressing process, and their anisotropic mechanical properties were investigated by
tensile and compressive tests of 0°(longitudinal)-, 45°-, and 90°(transverse)-orientation specimens. About 60
vol.% of tantalum fibers were homogeneously distributed inside the amorphous matrix, which contained a
small amount of polygonal crystalline particles. The ductility of the tantalum-continuous-fiber-reinforced
composite under tensile or compressive loading was dramatically improved over that of the monolithic
amorphous alloy, while maintaining high strength. When the fiber direction was not matched with the loading
direction, the reduction of the strength and ductility was not serious because of excellent fiber/matrix
interfacial strength. Observation of the anisotropic deformation and fracture behavior showed the formation
of multiple shear bands, the obstruction of crack propagation by fibers, and the deformation of fibers
themselves, thereby resulting in tensile elongation of 3%~4% and compressive elongation of 15%~30%. These
results suggest that the liquid pressing process was useful for the development of amorphous matrix
composites with excellent ductility and anisotropic mechanical properties.

영어초록

Zr-based amorphous alloy matrix composites reinforced with tantalum continuous fibers were
fabricated by the liquid pressing process, and their anisotropic mechanical properties were investigated by
tensile and compressive tests of 0°(longitudinal)-, 45°-, and 90°(transverse)-orientation specimens. About 60
vol.% of tantalum fibers were homogeneously distributed inside the amorphous matrix, which contained a
small amount of polygonal crystalline particles. The ductility of the tantalum-continuous-fiber-reinforced
composite under tensile or compressive loading was dramatically improved over that of the monolithic
amorphous alloy, while maintaining high strength. When the fiber direction was not matched with the loading
direction, the reduction of the strength and ductility was not serious because of excellent fiber/matrix
interfacial strength. Observation of the anisotropic deformation and fracture behavior showed the formation
of multiple shear bands, the obstruction of crack propagation by fibers, and the deformation of fibers
themselves, thereby resulting in tensile elongation of 3%~4% and compressive elongation of 15%~30%. These
results suggest that the liquid pressing process was useful for the development of amorphous matrix
composites with excellent ductility and anisotropic mechanical properties.

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