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.
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