Abstract
Objectives: In recent years, the demand of high performance, light-weight materials is being increased in automotive and aircraft industrial applications to achieve fuel economy. Methods: In the present work chill cast aluminum alloy matrix hybrid composites having 3 to 12 wt% of garnet in steps of 3 wt% and constant 3 wt% of Carbon, subject to different chilling materials have been developed to study the effect of chilling on microstructure, mechanical properties and dry sliding wear behavior of the composite samples. Metallic and nonmetallic chills were used to study the mechanical and tribological behavior of the samples and compared the same with non-chill cast specimens. The specimens taken from chill end of the casting were tested for their, hardness, tensile strength, fracture and wear behavior. Findings: Out of the results, copper chill is found to be good in improving mechanical properties because of its high Volumetric Heat Capacity (VHC). SEM was used to examine microstructural characterization and worn surfaces of the composite samples. Further, directional cooling with copper chill improves the wear resistance and mechanical behavior of the composites. Application/Improvements: Copper chill cast aluminum alloy hybrid composite reinforced with 9 wt% garnet and 3 wt% carbon exhibits better mechanical and tribological behavior and can be used in manufacturing piston in automobile applications. Keywords: Aluminum Hybrid, Copper Chill, Garnet, Stir Cast, Wear
Highlights
Aluminum matrix hybrid composites with dispersion of two or more ceramic reinforcements have been widely used in various applications of automotive and aerospacesectors[1]
In situ process is known for better bonding between matrix and reinforcements it is not developed for mass production
It is observed that hardness of the samples increases as the weight percentage of the reinforcement’s increases up to 9 wt% garnet
Summary
Aluminum matrix hybrid composites with dispersion of two or more ceramic reinforcements have been widely used in various applications of automotive and aerospacesectors[1]. Aluminum based hybrid composites shows improved primary and secondary properties over conventional base alloy[2,3]. Ceramic materials generally used to reinforce Al alloys are SiC, TiC, TiB2, ZrB2, AlN, Si3N4, Al2O3 and SiO2. These ceramic materials are with high strength and high hardness. It displays brittle behavior and has low resistance to fracture which can be improved by modifying the reinforcement grain size, shape and by incorporating additional phases[4]
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