Effect of Al on the Wetting Behavior Between TiC x and Molten Ti-Al Alloys
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INTRODUCTION
TITANIUM aluminum binary alloys have drawn much more attention in developing a high-temperature material for aerospace and automobile applications due to its attractive properties such as high melting temperature, high modulus, and low density. However, the poor wear resistance, poor oxidation resistance, and high-temperature strength has restricted its wide application. To further improve the properties, the metal matrix composites were put forward. Titanium carbide (TiC), which has good hardness, high melting temperature, good chemical and thermal stability, is usually used as reinforcement to prepare metal matrix composites.[1–3] Qin[4] in situ fabricated the Ti/TiC composites and measured the oxidation behavior of TMCs. The results showed that the addition of TiC can decrease the oxidation rate and benefit to form the enough strong interface cohesion. Zhu[5] prepared a 15 vol. pct TiC particulate-reinforced Ti-6Al-4V composite with the yield strength and the ultimate tensile strength that about 100 MPa higher is than those of matrix at all temperatures. XUYANG LIU, Ph.D. Student, is with the College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China, and also with the Department of Engineering, University of Leicester, Leicester LE1 7RH, U.K. XUEWEI LV and CHENGUANG BAI, Professors of Materials Engineering, and CHUNXIN LI, Master Student, are with the College of Materials Science and Engineering, Chongqing University. Contact e-mail: [email protected] HONGBIAO DONG, Professor of Materials Engineering, is with the Department of Engineering, University of Leicester. Manuscript submitted March 17, 2014. Article published online July 17, 2015 METALLURGICAL AND MATERIALS TRANSACTIONS A
Metal matrix composites are commonly prepared by liquid processing routes. Thus, the wettability between metal and ceramic is an important factor during processing.[6] The wetting behavior of the liquid and solid phases not only depends on the thermophysical properties of the system studied, but is also greatly influenced by the interface chemical reactions. Interfacial behavior between solid and liquid phases is critical to the performance of composite materials, such as strength, stiffness, and toughness. Therefore, to design and develop high performance of MMCs materials, a thorough understanding of interfacial characteristics is required. The wettability between TiC and metal/alloy has been the subject of many investigations.[7–10] However, very little studies have examined the wetting behavior of TiC substrates by Ti-Al alloy. Due to the high melting point of Ti-Al alloy, the wettability research is mainly focussed on pure Al or Ti-Al alloy with low Ti content. Froumin et al.[11] reported that the transition temperature from non-wetting to wetting for the Al/TiC system is between 1073 K and 1373 K (800 C and 1100 C) when stoichiometric TiCx composition changes. Similarly, Xiao[12] attributed wetting to the change in the hypostoichiometry of TiCx. Dariel[9] considered that the prese
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