Mechanical Properties of Composites Made of an Aluminum Alloy Matrix Reinforced with Titanium Nitride Particles, Consoli
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IAL research work on metal matrix composites (MMCs) was focused on MMCs reinforced with continuous fibers, such as C, SiC, B, B4C, or Al2O3, in the shape of filaments or strands, and the matrixes used were Al and Mg, and then Ti alloys.[1] However, aluminum alloys constitute the most common choice of all the metal matrixes for manufacturing MMCs[2] because of their properties.[3–8] Due to the cost/performance ratio consideration, the researcher’s interest has been focused on commercial applications of composite aluminum alloys with discontinuous reinforcements, such as SiCw, SiCp, Al2O3p, and J.L. ORTIZ and M.A. PE´REZ, Research Fellows, are with Mechanical Engineering Department, ITESM Campus Quere´taro, 76130 Santiago de Quere´taro, Mexico. Contact e-mail: [email protected]. V. AMIGO´, Research Fellow, is with Mechanical and Materials Engineering Department, Universidad Polite´cnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain; A. MANZANO, Research Fellow, on Sabatic Stay at ITESM, Campus Quere´taro, is on leave from CINVESTAV Unidad Quere´taro, Quere´taro, Qro. C.P. 76230, Mexico. Manuscript submitted May 15, 2006. METALLURGICAL AND MATERIALS TRANSACTIONS B
SiO2p.[9–14] In addition, the aluminum matrix composites with discontinuous reinforcements can be manufactured using standard procedures, such as melting, powder metallurgy, forging, extrusion, lamination, or welding.[15] Besides the improved mechanical properties that can be produced in Al-MMCs by adding ceramic particles, when these composites are processed by powder metallurgy techniques, they show an additional strength contribution, which is due to the dispersion of an oxide layer that covers the aluminum powders, when this layer is incorporated and dispersed conveniently as incoherent particles into the metallic matrix during the consolidation process.[16] Based on the results obtained by Shyu et al.[3] in a reactive route, and Huashun et al.[17] in Al-Mg-Ti melted alloys reinforced by the addition of TiN particles, the purpose of this investigative work was to evaluate the improvements produced in the mechanical behavior of an aluminum alloy matrix, by the addition of TiN particles processed by hot extrusion of cold compacted cylindrical forms of powder mixtures. The composites produced in this work were mixtures of an AlMgSiCu alloy with a very similar composition to AA6061, and using three volumetric percentages (vol pct) of TiN particles: 5, 10, and 15. TiN had a minimum purity of 99.8 pct, density of 5.22 g/cm3, and nominal particle size of 2 to 5 lm, and was supplied by Johnson Matthey (Alfa Aesar, Germany). The aluminum alloy powder was supplied by The Aluminum Powder Co. Ltd. (West Midland, England). Its chemical composition is provided in Table I, along with the specifications of the forged alloy in agreement with AA specifications. Figure 1 shows scanning electron micrographs of (a) powders of the AlMgSiCu alloy (round morphology) and (b) powders of TiN (polygonal morphology) used in this work. The powders were weighed using a precision sc
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