Effect of Particulate Reinforcements on the Mechanical Properties of Al6061-WC and Al6061-Gr MMCs
- 1 Research Scholar, Dr. M.G.R Educational & Research Institute, Chennai & Department Mechatronics Engineering, Acharya Institute of Technology, Bangalore, India.
- 2 GATES Institute of Technology, Gooty, Andhra Pradesh, India.
- 3 Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Bangalore, India.
- 4 Department of Mechanical Engineering, Alpha College of Engineering, Bangalore, India.
Abstract
This paper presents the comparative study of the mechanical properties of Al6061-Tungsten carbide composites containing Tungsten carbide (WC) particulate, and Al6061-graphite particulate composites containing graphite particles. The reinforcing particulates in the MMCs vary from 0% to 4% by weight. The 'vortex method' of production was employed to fabricate the composites, in which the reinforcements were poured into the vortex created by stirring the molten metal by means of a mechanical agitator. The composites so produced were subjected to a series of tests. The results of this study revealed that as the Tungsten carbide particle content was increased, there were significant increases in the ultimate tensile strength, hardness and Young's modulus, accompanied by a reduction in its ductility. There was, however, only a very marginal increase in the compressive strength, where as in graphite reinforced composites as the graphite content was increased, there were significant reduction in hardness and monotonic increases in the ductility, ultimate tensile strength (UTS), compressive strength and Young's modulus of the composite, An attempt is made in the paper to provide explanations for these phenomena.
- Everett R.K and Arsenault R.J. “Metal Matrix Composites: Mechanisms and Properties”, 1991 (Academic Press, San Diego).
- Kocjak M.J., Kahtri S.C., Allison J.E and Jones J.W., “Fundamentals of Metal Matrix Composites” (Ed S.Suresh, A.Mortensen and A.Needleman, 1993 (Butterworth- Heinemann, Boston)).
- Lloyd D.J. and Brotzen F.R., “Particle reinforced aluminium and Mg matrix composites” Int. Mater. Rev; 1994, 39,1-39.
- Lei M. and Ledbetter H., “Communications: elastic constants of SiCp/Al: measurements and modeling”, Metall. Mater. Trans., 1994, 25A, 2832-2835.
- Vogelsang M., Arsenault R. J. and Fisher R. M., “In-situ HVEM study of dislocation generation at Al/SiC interfaces”, Metall. Trans. A, 1986, 17, 379.
- Pai B. C., Ray S., Prabhakar, K. V. and Rohatgi P. K., “Fabrication of aluminiumalumina (magnesia) particulate composites in foundries using magnesium additions to the melts”, Mater. Sci. Engng, 1976,24,31.
- Sato A. and Mehrabian R., “Aluminium matrix composites: fabrication and properties”, Metall. Trans. B, 1976, 7, 443.
- Biswas S., Santharam A., Rao N.A.P Narayanaswamy, K. Rohatgi, P. and Biswas S. K. Tribology International 1980, 8, 171.
- Pai B. C., Pillai R.M. and Sathyanarayana K.G, “Prospects for graphite aluminium composites in engineering industries” Indian Journal of Engineering and Materials Science 1994, 1, October, 279.
- Krishnan B.P., Raman N., Narayanaswamy K and Rohtagi P.K. Wear, 1980, 60, 1.
- Bragg W. L., “Introduction to Crystal Analysis”, Bell and Son London, 1928, p. 64.
- Pillai U. T. S., Pandey R. K. and Nagam K. D. P., “Deformation and fracture of aluminium graphite and aluminium zircon particulate composites” Proc of the 5th International Conference on Composite Materials. TMS Publications, 1985, p. 895.
- Awerbuch J., Goering J. and Busking K., “In Mini Mechanics Analysis and Testing of Short Fibre Composites: Experimental Methods and Results”, Vol. 121, 1988. pp964 (American Society for Testing and Materials, Philadelphia. Pennsylvania).
- Smith W. F, “Structure and Properties of Engineering Alloys”, 2nd edn, McGraw-Hill, New York, 1993, p. 566.
- Badia F. A., McDonald D. F. and Pearson J. R. Trans. AFS 1971, 79, 269.
- Biswas S., Dwarakadasa E. and Biswas S. K, “Bearings and wear properties of cast graphite aluminium composites”, Proc. of All India Seminar on Aluminium, 1979.