摘要
利用X射线衍射仪分析了在高能球磨制备纳米Al_2O_3/Al混合粉体过程中,球磨时间和纳米Al_2O_3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Al_2O_3体积分数较低(5%)时可促进铝粉的破碎,但高含量的Al_O_3则对铝粉的球磨破碎不利。
The effects of milling time and nano-Al2O3 content on the grain size and lattice strain of aluminium phase during the high-energy hall 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 grainsgrew along the special crystal. Lower Al2O3 content （5vol%） could promote the aluminum powders crushing, but high Al2O3 coment would be disadvantageous to the crushing of the powder ball milling.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第12期30-32,53,共4页
Materials For Mechanical Engineering
