Grain Size and Structure Change of Al Phase during the Process of Nanosize Al₂O₃/Al Composite Powders Prepared by High-Energy Ball Milling

The effects of milling time and nano-Al2O3 content on the grain size and lattice strain of aluminium phase during the high-energy ball milling of nano-Al2O3/Al mixed powders were analyzed by using X-ray diffraction.The results show that in the initial stage of ball milling,the grain size of Al powders was refined from micron-size to nano-size.With the time extending further,high-energy ball milling provided energy to grain growth and recombining,the aluminum grains grew along the special crystal.Lower Al2O3 content (5vol%) could promote the aluminum powders crushing,but high Al2O3 content would be disadvantageous to the crushing of the powder ball milling.