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The powder of the micro Al and variant volume fractions of nano Al  2  O  3  were milled by a high energy planetary ball-mill. By milling, a homogenous distribution of nano Al  2  O  3  particles in the metal matrix were developed. Then the milled powder was cold compressed and sintered at 545°C for one hr. The mold and the sintered sample hold in a furnace until the temperature reached 545°C. Then the hot 27mm diameter sample was extruded to 6mm diameter. From the extruded specimens, tensile, hardness and microstructure of the prepared specimens were determined. By these tests the effect of milling time, the percent of nano-particles and the microstructure were evaluated. The hardness and tensile behaviors of aluminum matrix composites reinforced with nano Al  2  O  3  particulate have been found to increase remarkably with the volume fraction of the reinforcement.

international journal of modern physics. conference series

TENSILE PROPERTIES OF NANO AL2O3 PARTICULATE-REINFORCED ALUMINUM MATRIX COMPOSITES BY MECHANICAL ALLOYING AND HOT EXTRUSION