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用X射线和电镜(SEM和TEM)研究了高能球磨工艺对Mg2Ni贮氢合金纳米粉形成的影响。结果表明:球磨时间延长,振动频率提高和球料比的增大可有效地降低合金粉的晶粒尺寸。振动频率为25Hz条件下,不锈钢磨罐球磨1h后,合金粉的晶粒尺寸达到48.1nm。在球料比为5.85∶1,振动频率分别为20和30Hz的条件下,经4h球磨后不锈钢磨罐中粉末晶粒度为36.7和26.4nm。对球磨过程进行的理论模拟计算表明,增加球料比主要是通过加大单次碰撞粉末体获得的应变来缩短球磨时间;而提高振动频率,对单次碰撞粉末体获得的应变影响不大。
The effect of high energy ball milling on the formation of Mg2Ni hydrogen storage alloy nano-powder was studied by X-ray and electron microscope (SEM and TEM). The results show that the grain size of the alloy powder can be effectively reduced by prolonging the milling time, increasing the vibration frequency and increasing the material - material ratio. When the vibration frequency is 25Hz, the grain size of the alloy powder reaches 48.1nm after the ball mill of the stainless steel mill jar for 1h. Under the conditions of ball material ratio of 5.85:1, vibration frequency of 20 and 30Hz respectively, the grain size of the powder in the stainless steel grinding jar after 36h milling is 36.7 and 26.4nm. The theoretical simulation of the ball milling process shows that increasing the ball ratio mainly shortens the milling time by increasing the strain obtained by the single-shot powder. However, increasing the vibration frequency has little effect on the strain obtained by the single-shot powder.