2009•Materials for Mechanical EngineeringRequires access
Grain Size and Structure Change of Al Phase during the Process of Nanosize Al_2O_3/Al Composite Powders Prepared by High-Energy Ball Milling
Shi Ju-liang, Qian Dong-jie, Liu Shu-feng
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Abstract
The effects of milling time and nano-Al_2O_3 content on the grain size and lattice strain of aluminium phase during the high-energy ball milling of nano-Al_2O_3/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 aluminttm grains grew along the special crystal.Lower Al_2_O3 content (5vol%) could promote the aluminum powders crushing,but high Al_2O_3 content would be disadvantageous to the crushing of the powder ball milling.