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Abstract
The effect of thermal ageing on the microstructure and properties of 10wt% and 20wt%SiC particulate reinforced Al-Si-Fe matrix composite, produced by double stir casting route, have been studied. The composite samples were solution heat-treated at 500o C for 3 hrs and aged at 100, 200, and 300o C with ageing time between 60 and 660 minutes. The ageing characteristics of these grades of composite were evaluated using hardness values, impact energy, tensile properties and microstructure. The tensile strength, yield strength, hardness values increased as the percentage of silicon carbide increased in the alloy with decreased impact energy in both the as-cast and thermally age-hardened samples. The increases in hardness values and strength during thermal ageing are attributed to the formation of coherent and uniform precipitation in the metal lattice. It was found that both grades of composites showed acceleration in thermal ageing compared to the monolithic alloy. However, the 20wt%SiC reinforced composite showed more acceleration compared to 10wt%SiC reinforced composite.
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References
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- Aigbodion,V.S. and Hassan, S.B., 2007, “ Effect of Silicon Carbide Reinforcement on Microstructure and Properties of cast Al-Si-Fe/SiC Particulate Composites,” Materials Science and Engineering A: 447, pp. 355-360.
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- Bedir, F., 2006, "Fabrication of Two Layered Al-B4C Composites by Conventional Hot Pressing under Nitrogen Atmosphere and their Characterization,” J. of Mech.Sci. and Tech. KSME, Vol. 20(7), pp. 1002- 1011
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- Dieter.G.E., 1988, “ Mechanical Metallurgy,” McGraw- Hill Company, pp. 184-223.
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- Ikechukwuka, N.A., 1997, “Characterization of Aluminium Alloy 2618 and Its Composites Containing Alumina Particles,” unpublished PhD thesis Department Mechanical Engineering, University of Askatchewan, Saskatoon, pp. 87-200.
- Metals handbook, Mechanical testing, 1985, 9th edition, Vol. 8, American Society for Metals, the United States of America, pp. 250-257
- Rajan, T.V. and Sharma, C.P., 1988, “Heat Treatment Principles and Techniques,” Published by Prenticehall of India Private Limited, pp. 35-159.
- Rohatgi, P.K., Yarandi, F.M. and Liu, Y., Proc. of Inter. Symposium on Advances in Cast.
- Sagail, A., Leisk, G., 1992, “Heat Treatment Optimization of Alumina/Aluminium Metal Matrix Composites using the Taguchi Approach,” Scripta Metallurgica et Materials, pp. 871-876.
- Yaro, S.A., Aigbodion, V.S. and Mohammed, O.Y., “Effects of Copper Addition on the Mechanical Properties of Al-Si-Fe Alloy,” International Research Journal in Engineering & Technology (IREJEST) FUTO, Owerri, Nigeria, pp. 32-39.
- Whitehouse, A.F., Shahani, R. A. and Clyne, T.W., 1991, Metal Matrix Composites: Processing, Microstructure and Properties,” 12, International Symposium Roskilde, N.Hansen et al. eds, Ris National Laboratory, Denmark, pp. 74 1-748.
References
Aigbodion, V.S., 2007, “Development of Al-Si-Fe/SiC Particulate Composite as advanced Materials for Engineering Applications,” M.Sc Thesis, Department of Metallurgical Engineering, Ahmadu Bello University, Zaria, Nigeria, pp. 45-50.
Aigbodion,V.S. and Hassan, S.B., 2007, “ Effect of Silicon Carbide Reinforcement on Microstructure and Properties of cast Al-Si-Fe/SiC Particulate Composites,” Materials Science and Engineering A: 447, pp. 355-360.
Annual Books of ASTM Standards, 1990, Section 1. Iron and Steel Products, Vol. 261 01.04, pp. 13-63.
Bedir, F., 2006, "Fabrication of Two Layered Al-B4C Composites by Conventional Hot Pressing under Nitrogen Atmosphere and their Characterization,” J. of Mech.Sci. and Tech. KSME, Vol. 20(7), pp. 1002- 1011
Clyne, T.W., (ed.), 2000, “Comprehensive Composite Materials,” Vol. 3, Metal Matrix Composites (ser. eds), pp. 1-8.
Cottu, J.P., Coudere, J.J., Viguier, B. and Bernard, L., 1992, “ J. Mater Sci 27,” pp. 3068-3074.
Dieter.G.E., 1988, “ Mechanical Metallurgy,” McGraw- Hill Company, pp. 184-223.
Fishman, S.G. and Dhingra, A.K., 1988, “ Reinforced Metal Composites,” Materials Park, OH: ASM International Publication, p. 249.
Ikechukwuka, N.A., 1997, “Characterization of Aluminium Alloy 2618 and Its Composites Containing Alumina Particles,” unpublished PhD thesis Department Mechanical Engineering, University of Askatchewan, Saskatoon, pp. 87-200.
Metals handbook, Mechanical testing, 1985, 9th edition, Vol. 8, American Society for Metals, the United States of America, pp. 250-257
Rajan, T.V. and Sharma, C.P., 1988, “Heat Treatment Principles and Techniques,” Published by Prenticehall of India Private Limited, pp. 35-159.
Rohatgi, P.K., Yarandi, F.M. and Liu, Y., Proc. of Inter. Symposium on Advances in Cast.
Sagail, A., Leisk, G., 1992, “Heat Treatment Optimization of Alumina/Aluminium Metal Matrix Composites using the Taguchi Approach,” Scripta Metallurgica et Materials, pp. 871-876.
Yaro, S.A., Aigbodion, V.S. and Mohammed, O.Y., “Effects of Copper Addition on the Mechanical Properties of Al-Si-Fe Alloy,” International Research Journal in Engineering & Technology (IREJEST) FUTO, Owerri, Nigeria, pp. 32-39.
Whitehouse, A.F., Shahani, R. A. and Clyne, T.W., 1991, Metal Matrix Composites: Processing, Microstructure and Properties,” 12, International Symposium Roskilde, N.Hansen et al. eds, Ris National Laboratory, Denmark, pp. 74 1-748.