Studies on Al6061-SiC and Al7075-Al<sub>2</sub>O<sub>3</sub> Metal Matrix Composites

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-Al 2 O 3 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-Al 2 O 3 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 Al 2 O 3 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

An Experimental Investigation on Mechanical Behaviour of SiCp Reinforced Al 6061 MMC using Squeeze Casting Process

“…The soft aluminium is reinforced with hard and stiff ceramic particles. The structural aluminium alloys, such as 6xxx and 7xxx series are the most commonly used matrix materials due to their low density and high thermal conductivity [2]. In literature survey, some authors investigated and reported unreinforced alloys that gives less mechanical properties, compared to particulate reinforced composites.…”

Effect of Al2O3 Particles on Mechanical and Wear Properties of 6061al Alloy Metal Matrix Composites

“…Mahendra et al reported a higher tensile strength and hardness for Al-4.5% Cu alloy-fly ash based composites. kumar et al [4] in a study on Al7075-Al 2 O 3 metal matrix composites concluded that the tensile strength properties of composites are found higher than that of base matrix Al7075 alloy and also hardness of the composites increased with increased filler content. Long et al [7] reported the tensile strength of the Al6061-T6 alloy was increased by 20% by the reinforcement with 15 vol% of Al 2 O 3 fibers.…”

“…Aluminium alloy 6061 possesses very high corrosion resistance and excellent extricable in nature and exhibits moderate strength and finds much applications in the fields of construction like building and highway, automotive and marine applications [4]. The composites formed out of aluminium alloys are of wide interest owing to their high strength, fracture toughness, wear resistance and stiffness.…”

Mechanical Behavior of AL 7075 Reinforced with Al2O3 and SIC Nano Particles Fabricated by STIR Casting Method

“…The Brinell test has frequently used the method to examine the cast samplings [14]. Throughout the assessment tungsten ball indenter with diameter 10 mm by applying load for 10 seconds on five samples with three trails as shown in Table 6.…”