Dynamic Deformation Behavior of Zr-Based Amorphous Alloy Matrix Composites Reinforced with STS304 or Tantalum Fibers
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alloys with a high glassforming ability were developed by conventional casting methods, remarkable advances in amorphous alloys have been made.[1–6] Zr-based amorphous alloys show a high glass forming ability as well as excellent hardness, stiffness, strength, and corrosion resistance,[2,5,7,8] and thus, these alloys have been applied to high-performance structural components. However, they have poor ductility because they are fractured readily by the formation of localized shear bands under tensile and compressive loading conditions,[9,10] which prevents the wide application to structural materials. If amorphous alloy matrix composites, in which reinforcements or secondary YONGJIN KIM, Research Assistant, and SANG YONG SHIN and KI JONG KIM, Research Professors, are with the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, Korea. JIN SUNG KIM, formerly Research Assistant, with the Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 350701, Korea, is now Senior Researcher with the New Transportation Systems Research Center, Korea Railroad Research Institute, Uiwang 437-757, Korea. HOON HUH, Professor, is with the Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 350-701, Korea. SUNGHAK LEE, Professor, is with the Center for Advanced Aerospace Materials and the Materials Science, Pohang University of Science and Technology, is also with the Engineering Department, Pohang University of Science and Technology. Contact e-mail: [email protected] Manuscript submitted July 25, 2010. Article published online March 16, 2012 METALLURGICAL AND MATERIALS TRANSACTIONS A
phases are dispersed homogeneously in the amorphous alloy matrix, can be fabricated, then the problem of poor ductility can be solved while fully taking advantage of the amorphous alloys. To fabricate effectively the amorphous matrix composites reinforced with metallic continuous fibers, it is necessary to introduce new-concept fabrication technologies, one of which is a liquid pressing process.[11] Because this process uses a low pressure near the theoretically required minimum pressure, the crystallization of the amorphous matrix can be prevented or minimized by rapid cooling of the amorphous melt. It also has advantages of the elimination of the pores formed by contraction during solidification and complete infiltration of the melt into a fiber preform by the low hydrostatic pressure. Hays et al.[12] reported the enhanced ductility in a Zr-based amorphous alloy containing ductile crystalline particles because more shear bands were initiated than in a monolithic amorphous alloy. Most of these studies on Zr-based amorphous alloys and their composites are related to the phenomena that occur under static or quasi-static loading, and the deformation behavior under dynamic loading is studied rarely. It is required to obtain information on the dynamic deformation of amorphous alloys and their composites so that it can be applie
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