42 Analysis of Interfaces in AA7075/ Recycled WC Particles Composites Produced via Liquid Route 319 Loosening of Particles Liquid AI Diffusion flux AlCo formation WC particle Binder (Co) Cracks Fig. 42.10 Schema of the mechanism by which the WC particles would be separated from the granule The formation of the reaction layer between the matrix and the granules might be desirable, as it proportionates a metallurgical bond between the matrix and the reinforcement and, possibly, a more gradual transition between the two materials. Other interesting result was that little difference was observed in the reaction layer of the composites fabricated with contact temperature of 740◦C – for that temperature, similar results are obtained after 1 and 3 h contact times. Therefore, if a reaction layer is desirable, it can be obtained with the blandest mixing conditions, of 1 h/ 740 ◦C. 42.4 Conclusions This work investigated the possibility of producing, by casting, Al matrix composites reinforced with cemented carbide granules in such a way to promote metallurgical interaction between the matrix and the reinforcement. The obtained results indicate that the contact between the liquid metal and the cemented carbide granules propitiates the formation of a reaction layer between granules and matrix at contact temperatures above 700 ◦C (for the time intervals studied). The formation of that reaction layer consumes the granules, at the same time it forms a metallurgical bond between matrix and reinforcement. For the contact temperature of 740 ◦C, the contact time (within the 1 and 3 h conditions studied) had little influence in the extension of the reaction layer formed. For the contact temperature of 780 ◦C, the formation of compact and/or complex phases in the material was observed. Moreover, the cemented carbide granules were mostly consumed by the formation of other phases at that temperature. Acknowledgements The authors want to thank financial support from the Brazilian Government Agencies: CAPES and CNPq National Council for Scientific and Technological Development. References 1. Kainer, K.U.: Basics of metal matrix composites. In: Metal Matrix Composites: Custom-Made Materials for Automotive and Aerospace Engineering, pp. 1–54. Wiley-VGH Verlag Gmbh & Co, Weinheim (2006. Cap.1) 2. Hunt Jr., W.H.: Metal matrix composites: Applications. In: Jürgen, K.H.B., Cahn, R.W., Flemings, M.C., Ilschner, B., Kramer, E.J., Mahajan, S., Veyssière, P. (eds.) Encyclopaedia of Materials: Science and Technology, 2nd edn, pp. 5442–5446. Elsevier, Oxford (2001) 3. Singh, S., Singh, I., Dvivedi, A., Davim, J.P.: SiCp-Reinforced Al6063 MMCs: Mechanical behavior and microstructural analysis. In: International Conference on Research and Innovations in Mechanical Engineering, 2014, Ludhiana/India. Proceedings. . . ed. Springer India, vol. 1, pp. 451–464 (2014) 4. Mazahery, A., Abdizadeh, H., Baharvandi, H.R.: Development of high-performance A356/nano-Al2O3 composites. Mater. Sci. Eng. A. 518, 61–64 (2009) 5. Sukumaran, K., Ravikumar, K.K., Pillai, S.G.K., Rajan, T.P.D., Ravi, M., Pillai, R.M., Pai, B.C.: Studies on squeeze casting of Al2124 alloy and 2124 – 10% SiCp metal matrix composite. Mater. Sci. Eng. A. 490(1–2), 235–241 (2008)
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