Metal matrix composites (MMCs) combine attractive characteristics of ceramics and metals. Al-hybrid composites are a recent generation of MMCs and have the potential to satisfy new demands in advanced engineering applications. In this work, Al-MMC has been fabricated by mixing various percentages of Al2O3 and/or SiC reinforcement into the Al alloy, using stir casting. The mechanical properties (hardness, yield strength, tensile strength, elongation and flexural strength) have been measured for the fabricated MMCs. Grey relational analysis (GRA), based on the Taguchi method, is applied using three factors Al2O3, SiC and Al2O3 + SiC with three levels. Results show that the all reinforcement materials have a significant influence on the response. Results also show that the Taguchi-based grey relational approach improved the properties of output response of hybrid MMC.
A functionally graded material is a high-performance engineering material that can withstand extreme working conditions without losing its properties or failing during operation. The design, fabrication, and characterization of Al-Ni integrated into single functionally graded materials are presented in this study. FGM (Al-Ni) have been successfully fabricated using the powder metallurgy process. FGMs samples are made up of five layers, starting with Al on one side and ending with Ni on the other. The FGM (Al-Ni) samples used in this research were made up of the following percentages: (100 Al, 25 Ni-75Al, 50Ni-50Al, 75Ni-25Al, and 100Ni) wt%. The samples were pressed with a load of 800 MPa and sintered at temperature 600°C for 3 hours. In this research we applied the wear test and X-ray analysis of FGM (Al-Ni) samples where the intermetallic phases that formed were (AlNi3, Al0.9Ni1.1, Ni5Al3, Al3Ni2, Al4Ni3, AlNi,), in addition to optical microscopy images.
Materials that are functionally graded and have a layered structure made of nickel and aluminum were fabricated by powder metallurgy procedure. Al/Ni FGM consist of five layers. The functionally graded material sample starts with pure aluminum and ends with pure nickel. the graded layers were (25 Ni-75Al) %, (50 Ni-50 Al) % and (75 Ni-25Al) %. Samples were sintered at a temperature 600° C. Apparent density, green density, porosity, and shrinkage of each layer were measured.
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