Abstract
In recent years, the demand of high-performance and light-weight materials was increasing for industrial applications. The present research aims to study microstructural and mechanical properties of aluminum matrix hybrid reinforced 6-12 wt.% of garnet under the effects of materials chill casting during the manufacturing aluminum matrix composite. In this research work, metallic mold and no chills were used. In order to evaluate the quality of the chill end casting microstructure, hardness, and tensile tests were conducted on the prepared composite specimens. Aluminum matrix composites underwent the chill casting process have been examined using the optical microscope, scanning electron microscopy and X-ray diffraction. Microstructure outcomes of the casted Al-composites alloy indicated that having precipitations (Al2Si, AlCuMg2Si) and Garnet particulates hard within the Al-matrix. The results showed that the copper chill casting is the better one in terms of improving the mechanical properties because of its high volumetric heat capacity. Aluminum composite with addition of 9% Garnet composite produced via copper chill casting exhibits better mechanical properties.
Highlights
Aluminum matrix hybrid composites with dispersion of two or more ceramic reinforcements have been widely used in various applications of automotive and aerospace sectors[1]
Microstructure outcomes of the casted Al-composites alloy indicated that having precipitations (Al2Si, AlCuMg2Si) and Garnet particulates hard within the Al-matrix
The results showed that the copper chill casting is the better one in terms of improving the mechanical properties because of its high volumetric heat capacity
Summary
Aluminum matrix hybrid composites with dispersion of two or more ceramic reinforcements have been widely used in various applications of automotive and aerospace sectors[1]. Ceramic materials are generally used to reinforce aluminum-alloys with silicon carbide (SiC), titanium carbide (TiC), alumina (Al2O3), silicon oxide, TiB2, ZrB2, AlN, Si3N4 and SiO2 2,3. These ceramic materials have high strength and high hardness. Saravanakumar, Sasikumar and Sivasankaran[10] started their investigation on hybrid composites by fabricating of Al-6063/Al2O3/Gr using liquid metallurgy technique, and they have studied wear property using conventional tribometer apparatus for different parameters like sliding speed, applied loads as well the reinforcements effect addition of Gr (Garnet) is useful and led to the improvement of the mechanical properties. The application of chills will be used to improve the directional solidification and to achieve finer microstructure with improved mechanical properties
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