TITLE:
Studies on Al6061-SiC and Al7075-Al2O3 Metal Matrix Composites
AUTHORS:
G. B. Veeresh Kumar, C. S. P. Rao, N. Selvaraj, M. S. Bhagyashekar
KEYWORDS:
Al6061-SiC, Al7075-Al2O3, Metal Matrix Composites, Density, Microstructure, Hardness, Mechanical properties, Wear Factor.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.9 No.1,
January
20,
2010
ABSTRACT: The aluminum based composites are increasingly being used in the transport, aerospace,
marine, automobile and mineral processing industries, owing to their improved strength,
stiffness and wear resistance properties. The widely used reinforcing materials for these
composites are silicon carbide, aluminum oxide and graphite in the form of particles or
whiskers. The ceramic particles reinforced aluminum composites are termed as new generation
material and these can be tailored and engineered with specific required properties for specific
application requirements. Particle reinforced composites have a better plastic forming capability
than that of the whisker or fiber reinforced ones, and thus they have emerged as most sought
after material with cost advantage and they are also known for excellent heat and wear
resistance applications. In this paper it is aimed to present the experimental results of the studies
conducted regarding hardness, tensile strength and wear resistance properties of Al6061-SiC
and Al7075-Al2O3 composites. The composites are prepared using the liquid metallurgy technique, in which 2-6 wt. %’age of particulates were dispersed in the base matrix in steps of 2. The obtained cast composites of Al6061-SiC and Al7075-Al2O3 and the castings of the base alloys were carefully machined to prepare the test specimens for density, hardness, mechanical, tribological tests and as well as for microstructural studies as per ASTM standards. The SiC and Al2O3 resulted in improving the hardness and density of their respective composites. Further, the
increased %’age of these reinforcements contributed in increased hardness and density of the
composites. The microphotographs of the composites studied revealed the uniform distribution of the particles in the matrix system. The experimental density values were agreed with that of the
theoretical density values of the composites obtained using the rule of mixture for composites.
The dispersed SiC in Al6061 alloy and Al2O3 in Al7075 alloy contributed in enhancing the tensile strength of the composites. The wear factor K obtained using computerized pin on disc wear tester with counter surface as EN31 steel disc (HRC60) and the composite pin as
specimens, demonstrated the superior wear resistance property of the composites.