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텅스텐 다공성폼 강화 Zr계 비정질 기지 복합재료의 미세조직과 기계적 성질
손창영 ( Chang Young Son ),이상복 ( Sang Bok Lee ),이상관 ( Sang Kwan Lee ),김충년 ( Choong Nyun Paul Kim ),이성학 ( Sung Hak Lee ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.2
In the present study, a Zr-based amorphous alloy matrix composite reinforced with tungsten porous foam was fabricated without pores or defects by liquid pressing process, and its microstructures and mechanical properties were investigated. About 69 vol.% of tungsten foam was homogeneously distributed inside the amorphous matrix, although the matrix of the composite contained a small amount of crystalline phases. The compressive test results indicate that the composite was not fractured at one time after reaching the maximum compressive strength, but showed considerable plastic strain as the compressive load was sustained by tungsten foam. The tungsten foam greatly improved the strength (2764 MPa) and ductility (39.4%) of the composite by homogeneously dispersing the stress applied to the matrix. This was because the tungsten foam and matrix were simultaneously deformed without showing anisotropic deformation due to the excellent bonding of tungsten/matrix interfaces. These findings suggest that the liquid pressing process is useful for the development of amorphous matrix composites with improved strength and ductility.