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A mechanically alloyed mixture of Al-1 wt.% nano-alumina (n-Al 2 O 3 ) composite powders was produced using a planetary ball milling machine. Different milling times were applied to investigate the effect of milling time on the dispersion and microstructure of n-Al 2 O 3  particulate reinforcement within the aluminum matrix. A good homogeneous dispersion of n-Al 2 O 3  particulates was observed after 8 h of milling. Longer milling times had no significant effect on the dispersion and morphology of n-Al 2 O 3  particulates within the aluminum matrix because a steady state had been reached.

Microstructural evaluation of ball-milled nano Al 2 O 3 particulate-reinforced aluminum matrix composite powders