高能球磨制备Al-5％CuO复合粉体

Al-5%CuO Composite Powders Fabricated by High Energy Ball Milling

利用扫描电镜(SEM)、透射电镜(TEM)和X射线衍射(XRD)技术研究了Al-5％CuO粉末在高能球磨时颗粒形貌、显微组织和相组成的变化,以及200℃和400℃退火对它们的影响规律。结果表明,在高能球磨过程中Al与CuO和Cu2O之间发生了原位固态还原反应,生成的Cu元素主要以单质态存在;混合粉球磨形成的位错经回火后明显减少,冷焊条纹逐渐淡化、消失,晶粒形貌更加清晰;同时,复合粉体在回火过程中发生了与球磨时相逆的固态反应。

The particle morphology, microstructure and phase transformation of Al-5%CuO powders during high energy ball milling, as well as the influence of annealing treatments at 200℃ and 400℃ on them were studied by SEM, TEM and XRD techniques. The results indicated that Al powders were in situ reacted with CuO and Cu2O during the high energy ball milling, and the formed Cu element existed mainly in the state of single substance. Moreover, the dislocations formed by the ball milling decreased obviously after the annealing treatment, and the cold welding stripes became unclear gradually and disappeared finally, and the grain appearance became more distinguishable according to TEM. Additionally, it seems that a contrary reaction occurred during the ball milling process when the composite powders were anneal treated.