Materials characterization of silicon carbide reinforced titanium (Ti/SCS-6) metal matrix composites: Part I. Tensile an
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I.
INTRODUCTION
M E T A L matrix composites have become increasingly popular for critical structural applications because of their excellent stiffness-to-density and strength-to-density ratios. Specifically, silicon carbide (SIC) fiber reinforced titanium alloy composites provide great potential for structural applications in the aerospace industry. Compared to their monolithic counterparts, composites provide substantial weight savings due to greater strength retention at elevated temperatures, better dimensional stability, and higher specific mechanical properties. Metal matrix composites are applicable to various machined components, and they can be fabricated as extrusions, rolled sheets, and forgings. Moreover, metal matrix composites are especially attractive because they can be shaped, machined, drilled, etc. using conventional metal fabrication facilities. For traditional metals, such as steel alloys, aluminum, and titanium, a large database has been developed during the last century, which offers the designer a wealth of ma-
P.K. LIAW, Professor and Ivan Rancheff Chair of Excellence, is with the Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200. E.S. DIAZ, Senior Engineer, is with the Westinghouse Science and Technology Center, Pittsburgh, PA 15235. K.T. CHIANG and D.H. LOH, Members of Technical Staff, are with the Rocketdyne Division, Rockwell International Corporation, Canoga Park, CA 91309-7922. This article is based on a presentation made in the symposium entitled "Creep and Fatigue in Metal Matrix Composites" at the 1994 TMS/ASM Spring meeting, held February 28-March 3, 1994, in San Francisco, California, under the auspices of the Joint TMS-SMD/ASM-MSD Composite Materials Committee. METALLURGICALAND MATERIALSTRANSACTIONSA
terial information regarding fracture, corrosion, metallurgical and physical properties, etc. On the other hand, the databases for metal matrix composites are significantly lacking but are beginning to develop, and an increasing number of articles are appearing in the literature. To our knowledge, most of the research efforts on the Ti composite reinforced with continuous SiC fibers (SCS-6) have been directed at the material with unidirectional reinforcement fibers.[1-2~] Very little work has been conducted on the composite with a cross-ply reinforcement fiber arrangement.t22] Moreover, there has been no research work performed on flexural fatigue of Ti-15V-3Cr composites reinforced with cross-ply, continuous SiC fibers (SCS-6). This article is concerned with the materials characterization and theoretical modeling of a Ti-15V-3Cr composite reinforced with cross-ply, continuous SCS-6 fibers. In Part I of this series, the tensile and flexural fatigue behavior of Ti/SCS-6 composites is documented. In addition, the micromechanisms associated with the tensile and fatigue behavior of the Ti/SCS-6 composite are evaluated. In Part II, theoretical modeling of the fatigue behavior is described. II.
TEST MATERIAL
The material studied wa
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