Compressive and Tensile Properties of STS304-Continuous-Fiber-Reinforced Zr-Based Amorphous Alloy Matrix Composite Fabri
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CAUSE bulk amorphous alloys have excellent properties such as strength, stiffness, hardness, and corrosion resistance, due to of their peculiar liquidlike structures, they have been accepted as new advanced materials according to their potentialities in structural applications. For wider applications of amorphous alloys, however, there remain problems to be solved, typical of which is brittle fracture. The deformation of amorphous phases is carried out in localized shear bands due to the absence of dislocations in them, thereby resulting in abrupt fracture in a shear type.[1–3] In order to solve this problem, studies of developing composites, such as partial crystallization,[4–7] the addition of crystalline particles in amorphous melt,[8–10] and the infiltration of melt into a continuous metallic fiber preform,[11,12] have been actively carried out. While fabricating cast amorphous matrix composites reinforced with continuous metallic fibers, it is SANG-BOK LEE and SANG-KWAN LEE, Senior Researchers, are with the Composite Materials Laboratory, Korea Institute of Materials Science, Changwon, 641-010, Korea. KYUHONG LEE, formerly Postdoctoral Research Associate, Center for Advanced Aerospace Materials, Pohang University of Science and Technology, is Senior Researcher, Materials and Process Engineering, Samsung Techwin, Changwon, 641-831, Korea. SUNGHAK LEE, Professor, Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea, is jointly appointed with the Materials Science and Engineering Department, Pohang University of Science and Technology, Pohang, Korea. Contact e-mail: [email protected] Manuscript submitted December 3, 2008. Article published online September 23, 2009 METALLURGICAL AND MATERIALS TRANSACTIONS A
important to control the reactions of fibers with the amorphous melt, because most metallic fibers, except refractory metallic fibers, have high reactivity with the amorphous melt. To effectively fabricate amorphous matrix composites reinforced with continuous fibers, it is thus necessary to introduce new-concept fabrication technologies, one of which is a liquid pressing process.[13,14] This process might be considered as a reliable fabrication method of composites, because the crystallization of the amorphous matrix can be prevented or minimized by rapid cooling of the amorphous melt. In addition, it has the advantage of complete infiltration of the melt inside the fiber preform due to the application of low hydrostatic pressure near the theoretically required minimum loading pressure and to the elimination of pores formed by contraction during solidification. In this study, commercial STS304 stainless steel continuous fibers were used as reinforcements, because they are cost effective in comparison with refractory metals such as tungsten, tantalum, and molybdenum, and because they have excellent corrosion resistance and ductility. An amorphous matrix composite the matrix of which was a Zr-based amorphous alloy was fabricated by the liquid pressing process. The micr
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