Dynamic Compressive Properties of Zr-based Amorphous Matrix Composites Reinforced with Tungsten Continuous Fibers or Por
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REMARKABLE advances in amorphous alloys have been made since amorphous alloys having high amorphous forming ability were developed by conventional casting methods.[1–6] In particular, Zr-based amorphous alloys show high amorphous forming ability as well as excellent hardness, stiffness, strength, and corrosion resistance,[2–4,7–9] 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 a few shear bands under tensile and compressive loading conditions,[10,11] which prevents wide applications to structural components. If amorphous
CHANG-YOUNG SON, Senior Researcher, is with the Next Generation Products Research Group, Technical Research Laboratories, POSCO, Pohang 790-300, Korea. GYEONG SU KIM, Research Assistant, is with the Center for Advanced Aerospace Materials, Pohang University of Science and Technology. SANGBOK LEE and SANG-KWAN LEE, Senior Researchers, are with the Composite Materials Laboratory, Korea Institute of Materials Science, Changwon 641-831, Korea. HYOUNG SEOP KIM and SUNGHAK LEE, Professors, are with the Center for Advanced Aerospace Materials and with Materials Science and Engineering, Pohang University of Science and Technology. Contact e-mail: [email protected] Manuscript submitted May 23, 2011. Article published online February 3, 2012 METALLURGICAL AND MATERIALS TRANSACTIONS A
alloy matrix composites, in which fibers or secondary phase particles are dispersed homogeneously in the amorphous alloy matrix, can be fabricated, then the problem of poor ductility can be solved while fully using the advantages of amorphous alloys. Fabrication processes of amorphous matrix composites reinforced with fibers or secondary phase particles include the formation of dendritic crystalline phases from the amorphous melt,[12–14] the addition of crystalline particles to the amorphous melt,[13,15,16] and the casting of both reinforcements and amorphous alloys.[17,18] When fabricating cast amorphous matrix composites, it is important to control reactions of reinforcements with the amorphous melt. Thus, the development of newconcept fabrication technologies, one of which is a liquid pressing process using a low pressure near to the theoretically required minimum loading pressure,[19,20] is essentially needed. This process might be considered as a reliable fabrication method because the crystallization of the amorphous matrix can be prevented or minimized by rapid cooling of the amorphous melt. Recently, the enhanced ductility in a Zr-based amorphous alloy containing ductile crystalline particles was reported because more shear bands were initiated than in a monolithic amorphous alloy.[21] Most of these studies on Zr-based amorphous alloys and their composites are related to phenomena that occur under static or quasi-static loading, and the deformation behavior under dynamic loading are studied rarely. It is required VOLUME 43A, JUNE 2012—1911
to obtain information on the dynamic deformation of amor
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