was processed by a powder metallurgy process, and the effects of the addition of rare earth La 2 O 3 on the microstructures and mechanical properties were investigated by scanning electron microscopy and universal properties tests. The refinement mechanism of the rare earth oxide was investigated as well. It has found that the addition of La 2 O 3 increased the density of the sintered Al 2 O 3 /Al composite and the matrix grains were significantly refined. The addition of La 2 O 3 showed a remarkable improvement on the compression strength, which was up to more than 150% higher than that of materials not doped with rare earth oxides.
Al2O3 particle reinforced aluminum composites were prepared by powder metallurgy process. The effects of sintering temperature on microstructure and tribological characteristic were investigated with the combination of experimental results and theoretical analysis. The composite sintered at 550 oC shows high relative density and strong interfacial bonding, whereas the composites sintered at lower and higher temperature indicate no interfacial bonding and poor interfacial bonding, respectively. The surface morphology observed by scanning electron microscopy (SEM) indicated that the grains of the Al-based composites sintered at 550 oC were uniform and compact, which were in agreement with the properties of high density and tribological properties.
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