高能球磨制备纳米级Al2O3/Al复合粉体过程中铝相晶粒尺寸和结构的变化
Grain Size and Structure Change of Al Phase during the Process of Nanosize Al2O3/Al Composite Powders Prepared by High-Energy Ball Milling
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摘要: 利用X射线衍射仪分析了在高能球磨制备纳米Al2O3/Al混合粉体过程中,球磨时间和纳米Al2O3含量对铝相晶粒尺寸和晶格应变的影响.结果表明:在初期短时间的球磨中,微米铝粉的晶粒尺寸迅速细化到纳米级,但随着球磨时间的进一步延长,高能球磨为晶粒融合和再生长提供了能量,使铝晶粒沿着某些晶向有长大的趋势;当Al2O3体积分数较低(5%)时可促进铝粉的破碎,但高含量的Al2O3则对铝粉的球磨破碎不利.Abstract: 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.
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