A SEMI-SOLID FABRICATION TECHNIQUE OF AL 7075 METAL MATRIX COMPOSITES ENHANCED WITH ALUMINA

Document Type : Original Article

Authors

1 Mechanical Engineering Dept., Faculty of Engineering, Al-Azhar University, Cairo, Egypt

2 Department of Casting Technology Central Metallurgical Research and Development Institute (CMRDI)-Cairo-Egypt

10.21608/auej.2024.257021.1544

Abstract

Metal matrix composites (AMC) are in demand due to their desirable properties, including superior strength, cost-effectiveness, slow crack propagation, and high-temperature resistance. This work focuses on developing high-strength particulate-reinforced aluminum matrix composites via semi solid state route. The objective of this work is to fabricate Al 7075-Al2O3 composites with 4 , 8 and 10 wt. % of Al2O3 using the semi-solid stir casting technique. Aluminum alloy 7075 was heated above its melting point, followed by controlled cooling to the semi-solid state at 550⁰C. Al2O3 particles then heated and mixed with Aluminum alloy at 350 RPM. The study investigates the effect of the manufacturing procedure on the microstructure and mechanical properties of as-cast Al 7075 matrix composites. Results include microstructure, porosity, and distribution of Al2O3 particles in Al 7075 alloy samples using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive x-ray (spectroscopy) (EDX), and x-ray diffraction (XRD). Hardness and tensile strength are reported, showing high evenness of reinforcement distribution and uniform mechanical strength. The highest ultimate tensile strength (231.5 MPa) and the maximum hardness value (187.5 HV), is achieved at 10% Alumina reinforcement; demonstrating the effectiveness of the devised manufacturing method
 
Special Issue of AEIC 2024 (Mechanical & Chemical and Material Engineering  Session)

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Journal of Al-Azhar University Engineering Sector
Volume 19, Issue 72
Special Issue for Al-Azhar Engineering 16th. International Conference (AEIC 2024)
July 2024
Pages 131-146

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