Nano alumina particle-reinforced magnesium was fabricated by powder metallurgy technique. Powders were mixed by ball milling (without balls) for 6 hours at rotation speed 60 rpm. Then, the powder was compacted at 550 MPa and sintered at 530°C for 2 hours. The magnesium contained 0.25, 0.5, 1, 1.5, 3, and 5 vol. % nano alumina Al2O3. The physical, mechanical properties and microstructures, such as density, porosity, compressive strength, hardness, wear rate, SEM and EDX, were measured and compared with the values of unmodified pure magnesium samples. The results revealed an improvement with Al2O3 in Mg matrix composites. The greatest improvement in UCS and Hv values were about 197 MPa and 70 Hv at the volume fraction of 3 vol.% Al2O3 respectively. The wear tests showed that wear resistance was increased with the increasing of the reinforcement volume fraction of Al2O3.
In the present study, magnesium-based composites reinforced with different volume fractions (3, 5, 10, and 15) vol.% of micro sized Al2O3 particulates were fabricated by powder metallurgy technique which involves mixed, compacted and sintered. Powders were mixed by ball milling (without balls) for 6 hours at rotation speed 60 rpm. Then powder was compacted at 550 MPa and sintered at 530˚C for 2 hours. Microstructures of sintered composites have been investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) energy dispersive. SEM image of sinter samples exhibit good bonding between the magnesium matrix and the alumina. The microhardness and wear resistance of micro composites has been improved significantly compared to that of pure magnesium. Highest value of microhardness is 97 HV at the volume fraction of 10 vol.% Al2O3.
Multi-Walled Carbon Nanotubes (MWNTs) reinforced magnesium was prepared using a powder metallurgy technique. Powders were mixed by ball milling (without balls) for 6 h at rotation speed 60 rpm. Samples were compacted at 550 MPa. And sintered at 530°C for 2 h. The magnesium containing 0.1, 0.2, 0.4 and 0.6 vol.% Carbon Nanotubes (CNTs). The physical and mechanical properties such as density, porosity, compressive strength, hardness and wear rate were measured and compared with the unmodified pure magnesium samples values. Results of density referred to the ability to manufacture lightweight composites. The results of mechanical properties revealed that the being of CNTs in the Mg matrix composites significant melioration compressive strength. The best improvement UCS is about (172 MPa) at the volume fraction of 0.4 vol.% carbon nanotube. The effect of CNTs on the micro Hardness (Hv) values has very limited. The wear tests showed that the wear resistance is increased with the increasing of the reinforcement volume fraction of CNTs.
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